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Finding the Fourth Proportional to 42,007,907.70, 62,986,978.35 and 21,852,515.70

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Solution

The fourth proportional to 42,007,907.70, 62,986,978.35 and 21,852,515.70 is: 32,765,829.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,007,907.70 : 62,986,978.35 = 21,852,515.70 : x
  2. Step 2: Convert to fraction form
    42,007,907.70/62,986,978.35 = 21,852,515.70/x
  3. Step 3: Cross multiply
    42,007,907.70x = 62,986,978.35 × 21,852,515.70
  4. Step 4: Simplify right side
    42,007,907.70x = 1,376,423,933,288,935
  5. Step 5: Solve for x
    x = 1,376,423,933,288,935/42,007,907.70
  6. Step 6: Final answer
    x = 32,765,829.31

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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.