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Finding the Fourth Proportional to 415,215.90, 621,839.70 and 415,215.90

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Solution

The fourth proportional to 415,215.90, 621,839.70 and 415,215.90 is: 621,839.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,215.90 : 621,839.70 = 415,215.90 : x
  2. Step 2: Convert to fraction form
    415,215.90/621,839.70 = 415,215.90/x
  3. Step 3: Cross multiply
    415,215.90x = 621,839.70 × 415,215.90
  4. Step 4: Simplify right side
    415,215.90x = 258,197,730,691.23
  5. Step 5: Solve for x
    x = 258,197,730,691.23/415,215.90
  6. Step 6: Final answer
    x = 621,839.70

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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.