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Finding the Fourth Proportional to 21,987.81, 30,343.21 and 11,916.25

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Solution

The fourth proportional to 21,987.81, 30,343.21 and 11,916.25 is: 16,444.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.81 : 30,343.21 = 11,916.25 : x
  2. Step 2: Convert to fraction form
    21,987.81/30,343.21 = 11,916.25/x
  3. Step 3: Cross multiply
    21,987.81x = 30,343.21 × 11,916.25
  4. Step 4: Simplify right side
    21,987.81x = 361,577,216.58
  5. Step 5: Solve for x
    x = 361,577,216.58/21,987.81
  6. Step 6: Final answer
    x = 16,444.44

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Double scale
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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.