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Finding the Fourth Proportional to 438,321.78, 656,486.22 and 342,957.66

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Solution

The fourth proportional to 438,321.78, 656,486.22 and 342,957.66 is: 513,656.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,321.78 : 656,486.22 = 342,957.66 : x
  2. Step 2: Convert to fraction form
    438,321.78/656,486.22 = 342,957.66/x
  3. Step 3: Cross multiply
    438,321.78x = 656,486.22 × 342,957.66
  4. Step 4: Simplify right side
    438,321.78x = 225,146,977,833.45
  5. Step 5: Solve for x
    x = 225,146,977,833.45/438,321.78
  6. Step 6: Final answer
    x = 513,656.83

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1.5x scale

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.