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Finding the Fourth Proportional to 55,987.20, 83,980.80 and 20,922.30

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Solution

The fourth proportional to 55,987.20, 83,980.80 and 20,922.30 is: 31,383.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,987.20 : 83,980.80 = 20,922.30 : x
  2. Step 2: Convert to fraction form
    55,987.20/83,980.80 = 20,922.30/x
  3. Step 3: Cross multiply
    55,987.20x = 83,980.80 × 20,922.30
  4. Step 4: Simplify right side
    55,987.20x = 1,757,071,491.84
  5. Step 5: Solve for x
    x = 1,757,071,491.84/55,987.20
  6. Step 6: Final answer
    x = 31,383.45

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.