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Finding the Fourth Proportional to 663,321.66, 915,269.13 and 391,369.02

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Solution

The fourth proportional to 663,321.66, 915,269.13 and 391,369.02 is: 540,021.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,321.66 : 915,269.13 = 391,369.02 : x
  2. Step 2: Convert to fraction form
    663,321.66/915,269.13 = 391,369.02/x
  3. Step 3: Cross multiply
    663,321.66x = 915,269.13 × 391,369.02
  4. Step 4: Simplify right side
    663,321.66x = 358,207,982,444.35
  5. Step 5: Solve for x
    x = 358,207,982,444.35/663,321.66
  6. Step 6: Final answer
    x = 540,021.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.