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Finding the Fourth Proportional to 488,428.80, 731,671.20 and 429,979.20

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Solution

The fourth proportional to 488,428.80, 731,671.20 and 429,979.20 is: 644,113.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    488,428.80 : 731,671.20 = 429,979.20 : x
  2. Step 2: Convert to fraction form
    488,428.80/731,671.20 = 429,979.20/x
  3. Step 3: Cross multiply
    488,428.80x = 731,671.20 × 429,979.20
  4. Step 4: Simplify right side
    488,428.80x = 314,603,397,239.04
  5. Step 5: Solve for x
    x = 314,603,397,239.04/488,428.80
  6. Step 6: Final answer
    x = 644,113.12

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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.