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Finding the Fourth Proportional to 66,474,342.40, 99,720,844.80 and 21,031,398.40

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Solution

The fourth proportional to 66,474,342.40, 99,720,844.80 and 21,031,398.40 is: 31,550,049.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,474,342.40 : 99,720,844.80 = 21,031,398.40 : x
  2. Step 2: Convert to fraction form
    66,474,342.40/99,720,844.80 = 21,031,398.40/x
  3. Step 3: Cross multiply
    66,474,342.40x = 99,720,844.80 × 21,031,398.40
  4. Step 4: Simplify right side
    66,474,342.40x = 2,097,268,815,773,368
  5. Step 5: Solve for x
    x = 2,097,268,815,773,368/66,474,342.40
  6. Step 6: Final answer
    x = 31,550,049.84

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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.