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Finding the Fourth Proportional to 399,312.60, 598,968.90 and 133,081.80

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Solution

The fourth proportional to 399,312.60, 598,968.90 and 133,081.80 is: 199,622.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,312.60 : 598,968.90 = 133,081.80 : x
  2. Step 2: Convert to fraction form
    399,312.60/598,968.90 = 133,081.80/x
  3. Step 3: Cross multiply
    399,312.60x = 598,968.90 × 133,081.80
  4. Step 4: Simplify right side
    399,312.60x = 79,711,859,356.02
  5. Step 5: Solve for x
    x = 79,711,859,356.02/399,312.60
  6. Step 6: Final answer
    x = 199,622.70

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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.