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Finding the Fourth Proportional to 611,713.80, 917,570.70 and 257,419.80

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Solution

The fourth proportional to 611,713.80, 917,570.70 and 257,419.80 is: 386,129.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,713.80 : 917,570.70 = 257,419.80 : x
  2. Step 2: Convert to fraction form
    611,713.80/917,570.70 = 257,419.80/x
  3. Step 3: Cross multiply
    611,713.80x = 917,570.70 × 257,419.80
  4. Step 4: Simplify right side
    611,713.80x = 236,200,866,079.86
  5. Step 5: Solve for x
    x = 236,200,866,079.86/611,713.80
  6. Step 6: Final answer
    x = 386,129.70

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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.