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Finding the Fourth Proportional to 66,239,892.40, 99,359,838.60 and 20,806,279.60

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Solution

The fourth proportional to 66,239,892.40, 99,359,838.60 and 20,806,279.60 is: 31,209,419.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,239,892.40 : 99,359,838.60 = 20,806,279.60 : x
  2. Step 2: Convert to fraction form
    66,239,892.40/99,359,838.60 = 20,806,279.60/x
  3. Step 3: Cross multiply
    66,239,892.40x = 99,359,838.60 × 20,806,279.60
  4. Step 4: Simplify right side
    66,239,892.40x = 2,067,308,582,922,472.50
  5. Step 5: Solve for x
    x = 2,067,308,582,922,472.50/66,239,892.40
  6. Step 6: Final answer
    x = 31,209,419.40

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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.