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Finding the Fourth Proportional to 310,505.70, 428,500.24 and 172,686.57

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Solution

The fourth proportional to 310,505.70, 428,500.24 and 172,686.57 is: 238,308.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,505.70 : 428,500.24 = 172,686.57 : x
  2. Step 2: Convert to fraction form
    310,505.70/428,500.24 = 172,686.57/x
  3. Step 3: Cross multiply
    310,505.70x = 428,500.24 × 172,686.57
  4. Step 4: Simplify right side
    310,505.70x = 73,996,235,622.55
  5. Step 5: Solve for x
    x = 73,996,235,622.55/310,505.70
  6. Step 6: Final answer
    x = 238,308.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.