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Finding the Fourth Proportional to 118,935.40, 178,403.10 and 72,279.40

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Solution

The fourth proportional to 118,935.40, 178,403.10 and 72,279.40 is: 108,419.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,935.40 : 178,403.10 = 72,279.40 : x
  2. Step 2: Convert to fraction form
    118,935.40/178,403.10 = 72,279.40/x
  3. Step 3: Cross multiply
    118,935.40x = 178,403.10 × 72,279.40
  4. Step 4: Simplify right side
    118,935.40x = 12,894,869,026.14
  5. Step 5: Solve for x
    x = 12,894,869,026.14/118,935.40
  6. Step 6: Final answer
    x = 108,419.10

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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.