Home / 38,987.06-53,790.90-21,990.44

Finding the Fourth Proportional to 38,987.06, 53,790.90 and 21,990.44

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Solution

The fourth proportional to 38,987.06, 53,790.90 and 21,990.44 is: 30,340.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,987.06 : 53,790.90 = 21,990.44 : x
  2. Step 2: Convert to fraction form
    38,987.06/53,790.90 = 21,990.44/x
  3. Step 3: Cross multiply
    38,987.06x = 53,790.90 × 21,990.44
  4. Step 4: Simplify right side
    38,987.06x = 1,182,885,559.00
  5. Step 5: Solve for x
    x = 1,182,885,559.00/38,987.06
  6. Step 6: Final answer
    x = 30,340.47

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.