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Finding the Fourth Proportional to 18,904.30, 28,387.17 and 9,688.30

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Solution

The fourth proportional to 18,904.30, 28,387.17 and 9,688.30 is: 14,548.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,904.30 : 28,387.17 = 9,688.30 : x
  2. Step 2: Convert to fraction form
    18,904.30/28,387.17 = 9,688.30/x
  3. Step 3: Cross multiply
    18,904.30x = 28,387.17 × 9,688.30
  4. Step 4: Simplify right side
    18,904.30x = 275,023,419.11
  5. Step 5: Solve for x
    x = 275,023,419.11/18,904.30
  6. Step 6: Final answer
    x = 14,548.19

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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.