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Finding the Fourth Proportional to 91,291.70, 136,937.55 and 42,139.70

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Solution

The fourth proportional to 91,291.70, 136,937.55 and 42,139.70 is: 63,209.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,291.70 : 136,937.55 = 42,139.70 : x
  2. Step 2: Convert to fraction form
    91,291.70/136,937.55 = 42,139.70/x
  3. Step 3: Cross multiply
    91,291.70x = 136,937.55 × 42,139.70
  4. Step 4: Simplify right side
    91,291.70x = 5,770,507,275.74
  5. Step 5: Solve for x
    x = 5,770,507,275.74/91,291.70
  6. Step 6: Final answer
    x = 63,209.55

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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.