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Finding the Fourth Proportional to 91,512.70, 137,159.70 and 47,116.60

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Solution

The fourth proportional to 91,512.70, 137,159.70 and 47,116.60 is: 70,618.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,512.70 : 137,159.70 = 47,116.60 : x
  2. Step 2: Convert to fraction form
    91,512.70/137,159.70 = 47,116.60/x
  3. Step 3: Cross multiply
    91,512.70x = 137,159.70 × 47,116.60
  4. Step 4: Simplify right side
    91,512.70x = 6,462,498,721.02
  5. Step 5: Solve for x
    x = 6,462,498,721.02/91,512.70
  6. Step 6: Final answer
    x = 70,618.60

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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.