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Finding the Fourth Proportional to 28,412.62, 39,209.62 and 15,666.28

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Solution

The fourth proportional to 28,412.62, 39,209.62 and 15,666.28 is: 21,619.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,412.62 : 39,209.62 = 15,666.28 : x
  2. Step 2: Convert to fraction form
    28,412.62/39,209.62 = 15,666.28/x
  3. Step 3: Cross multiply
    28,412.62x = 39,209.62 × 15,666.28
  4. Step 4: Simplify right side
    28,412.62x = 614,268,885.61
  5. Step 5: Solve for x
    x = 614,268,885.61/28,412.62
  6. Step 6: Final answer
    x = 21,619.58

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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.