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Finding the Fourth Proportional to 20,987.28, 28,970.04 and 13,916.04

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Solution

The fourth proportional to 20,987.28, 28,970.04 and 13,916.04 is: 19,209.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.28 : 28,970.04 = 13,916.04 : x
  2. Step 2: Convert to fraction form
    20,987.28/28,970.04 = 13,916.04/x
  3. Step 3: Cross multiply
    20,987.28x = 28,970.04 × 13,916.04
  4. Step 4: Simplify right side
    20,987.28x = 403,148,235.44
  5. Step 5: Solve for x
    x = 403,148,235.44/20,987.28
  6. Step 6: Final answer
    x = 19,209.17

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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.