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Finding the Fourth Proportional to 72,643.70, 108,706.35 and 66,422.90

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Solution

The fourth proportional to 72,643.70, 108,706.35 and 66,422.90 is: 99,397.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,643.70 : 108,706.35 = 66,422.90 : x
  2. Step 2: Convert to fraction form
    72,643.70/108,706.35 = 66,422.90/x
  3. Step 3: Cross multiply
    72,643.70x = 108,706.35 × 66,422.90
  4. Step 4: Simplify right side
    72,643.70x = 7,220,591,015.42
  5. Step 5: Solve for x
    x = 7,220,591,015.42/72,643.70
  6. Step 6: Final answer
    x = 99,397.35

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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.