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Finding the Fourth Proportional to 657,712.80, 986,569.20 and 405,770.40

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Solution

The fourth proportional to 657,712.80, 986,569.20 and 405,770.40 is: 608,655.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,712.80 : 986,569.20 = 405,770.40 : x
  2. Step 2: Convert to fraction form
    657,712.80/986,569.20 = 405,770.40/x
  3. Step 3: Cross multiply
    657,712.80x = 986,569.20 × 405,770.40
  4. Step 4: Simplify right side
    657,712.80x = 400,320,578,911.68
  5. Step 5: Solve for x
    x = 400,320,578,911.68/657,712.80
  6. Step 6: Final answer
    x = 608,655.60

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Similar ratio
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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.