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Finding the Fourth Proportional to 663,040.96, 915,106.26 and 391,175.32

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Solution

The fourth proportional to 663,040.96, 915,106.26 and 391,175.32 is: 539,886.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,040.96 : 915,106.26 = 391,175.32 : x
  2. Step 2: Convert to fraction form
    663,040.96/915,106.26 = 391,175.32/x
  3. Step 3: Cross multiply
    663,040.96x = 915,106.26 × 391,175.32
  4. Step 4: Simplify right side
    663,040.96x = 357,966,984,089.50
  5. Step 5: Solve for x
    x = 357,966,984,089.50/663,040.96
  6. Step 6: Final answer
    x = 539,886.68

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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.