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Finding the Fourth Proportional to 28,681.54, 39,581.02 and 15,935.88

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Solution

The fourth proportional to 28,681.54, 39,581.02 and 15,935.88 is: 21,991.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,681.54 : 39,581.02 = 15,935.88 : x
  2. Step 2: Convert to fraction form
    28,681.54/39,581.02 = 15,935.88/x
  3. Step 3: Cross multiply
    28,681.54x = 39,581.02 × 15,935.88
  4. Step 4: Simplify right side
    28,681.54x = 630,758,385.00
  5. Step 5: Solve for x
    x = 630,758,385.00/28,681.54
  6. Step 6: Final answer
    x = 21,991.79

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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.