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Finding the Fourth Proportional to 257,141.80, 385,770.30 and 99,356.20

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Solution

The fourth proportional to 257,141.80, 385,770.30 and 99,356.20 is: 149,056.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,141.80 : 385,770.30 = 99,356.20 : x
  2. Step 2: Convert to fraction form
    257,141.80/385,770.30 = 99,356.20/x
  3. Step 3: Cross multiply
    257,141.80x = 385,770.30 × 99,356.20
  4. Step 4: Simplify right side
    257,141.80x = 38,328,671,080.86
  5. Step 5: Solve for x
    x = 38,328,671,080.86/257,141.80
  6. Step 6: Final answer
    x = 149,056.56

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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.