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Finding the Fourth Proportional to 78,707.70, 118,061.55 and 70,931.70

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Solution

The fourth proportional to 78,707.70, 118,061.55 and 70,931.70 is: 106,397.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,707.70 : 118,061.55 = 70,931.70 : x
  2. Step 2: Convert to fraction form
    78,707.70/118,061.55 = 70,931.70/x
  3. Step 3: Cross multiply
    78,707.70x = 118,061.55 × 70,931.70
  4. Step 4: Simplify right side
    78,707.70x = 8,374,306,446.14
  5. Step 5: Solve for x
    x = 8,374,306,446.14/78,707.70
  6. Step 6: Final answer
    x = 106,397.55

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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.