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Finding the Fourth Proportional to 18,948.78, 28,423.15 and 5,097.78

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Solution

The fourth proportional to 18,948.78, 28,423.15 and 5,097.78 is: 7,646.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,948.78 : 28,423.15 = 5,097.78 : x
  2. Step 2: Convert to fraction form
    18,948.78/28,423.15 = 5,097.78/x
  3. Step 3: Cross multiply
    18,948.78x = 28,423.15 × 5,097.78
  4. Step 4: Simplify right side
    18,948.78x = 144,894,965.61
  5. Step 5: Solve for x
    x = 144,894,965.61/18,948.78
  6. Step 6: Final answer
    x = 7,646.66

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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.