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Finding the Fourth Proportional to 611,691.60, 917,537.40 and 399,115.20

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Solution

The fourth proportional to 611,691.60, 917,537.40 and 399,115.20 is: 598,672.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,691.60 : 917,537.40 = 399,115.20 : x
  2. Step 2: Convert to fraction form
    611,691.60/917,537.40 = 399,115.20/x
  3. Step 3: Cross multiply
    611,691.60x = 917,537.40 × 399,115.20
  4. Step 4: Simplify right side
    611,691.60x = 366,203,122,908.48
  5. Step 5: Solve for x
    x = 366,203,122,908.48/611,691.60
  6. Step 6: Final answer
    x = 598,672.80

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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.