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Finding the Fourth Proportional to 611,712.80, 917,569.20 and 399,136.40

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Solution

The fourth proportional to 611,712.80, 917,569.20 and 399,136.40 is: 598,704.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,712.80 : 917,569.20 = 399,136.40 : x
  2. Step 2: Convert to fraction form
    611,712.80/917,569.20 = 399,136.40/x
  3. Step 3: Cross multiply
    611,712.80x = 917,569.20 × 399,136.40
  4. Step 4: Simplify right side
    611,712.80x = 366,235,267,238.88
  5. Step 5: Solve for x
    x = 366,235,267,238.88/611,712.80
  6. Step 6: Final answer
    x = 598,704.60

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Similar ratio
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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.