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Finding the Fourth Proportional to 385,909.60, 578,086.80 and 219,503.20

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Solution

The fourth proportional to 385,909.60, 578,086.80 and 219,503.20 is: 328,812.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,909.60 : 578,086.80 = 219,503.20 : x
  2. Step 2: Convert to fraction form
    385,909.60/578,086.80 = 219,503.20/x
  3. Step 3: Cross multiply
    385,909.60x = 578,086.80 × 219,503.20
  4. Step 4: Simplify right side
    385,909.60x = 126,891,902,477.76
  5. Step 5: Solve for x
    x = 126,891,902,477.76/385,909.60
  6. Step 6: Final answer
    x = 328,812.51

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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.