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Finding the Fourth Proportional to 66,887,643.80, 100,331,465.70 and 56,683,976.60

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Solution

The fourth proportional to 66,887,643.80, 100,331,465.70 and 56,683,976.60 is: 85,025,964.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,887,643.80 : 100,331,465.70 = 56,683,976.60 : x
  2. Step 2: Convert to fraction form
    66,887,643.80/100,331,465.70 = 56,683,976.60/x
  3. Step 3: Cross multiply
    66,887,643.80x = 100,331,465.70 × 56,683,976.60
  4. Step 4: Simplify right side
    66,887,643.80x = 5,687,186,453,982,503
  5. Step 5: Solve for x
    x = 5,687,186,453,982,503/66,887,643.80
  6. Step 6: Final answer
    x = 85,025,964.90

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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.