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Finding the Fourth Proportional to 385,631.30, 577,280.55 and 343,640.90

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Solution

The fourth proportional to 385,631.30, 577,280.55 and 343,640.90 is: 514,421.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,631.30 : 577,280.55 = 343,640.90 : x
  2. Step 2: Convert to fraction form
    385,631.30/577,280.55 = 343,640.90/x
  3. Step 3: Cross multiply
    385,631.30x = 577,280.55 × 343,640.90
  4. Step 4: Simplify right side
    385,631.30x = 198,377,207,754.50
  5. Step 5: Solve for x
    x = 198,377,207,754.50/385,631.30
  6. Step 6: Final answer
    x = 514,421.96

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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.