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Finding the Fourth Proportional to 488,389.80, 731,612.70 and 429,940.20

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Solution

The fourth proportional to 488,389.80, 731,612.70 and 429,940.20 is: 644,054.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    488,389.80 : 731,612.70 = 429,940.20 : x
  2. Step 2: Convert to fraction form
    488,389.80/731,612.70 = 429,940.20/x
  3. Step 3: Cross multiply
    488,389.80x = 731,612.70 × 429,940.20
  4. Step 4: Simplify right side
    488,389.80x = 314,549,710,560.54
  5. Step 5: Solve for x
    x = 314,549,710,560.54/488,389.80
  6. Step 6: Final answer
    x = 644,054.63

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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.