Home / 109,397.92-163,979.68-78,138.40

Finding the Fourth Proportional to 109,397.92, 163,979.68 and 78,138.40

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Solution

The fourth proportional to 109,397.92, 163,979.68 and 78,138.40 is: 117,123.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,397.92 : 163,979.68 = 78,138.40 : x
  2. Step 2: Convert to fraction form
    109,397.92/163,979.68 = 78,138.40/x
  3. Step 3: Cross multiply
    109,397.92x = 163,979.68 × 78,138.40
  4. Step 4: Simplify right side
    109,397.92x = 12,813,109,827.71
  5. Step 5: Solve for x
    x = 12,813,109,827.71/109,397.92
  6. Step 6: Final answer
    x = 117,123.89

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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.