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Finding the Fourth Proportional to 661,647.60, 992,471.40 and 409,705.20

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Solution

The fourth proportional to 661,647.60, 992,471.40 and 409,705.20 is: 614,557.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,647.60 : 992,471.40 = 409,705.20 : x
  2. Step 2: Convert to fraction form
    661,647.60/992,471.40 = 409,705.20/x
  3. Step 3: Cross multiply
    661,647.60x = 992,471.40 × 409,705.20
  4. Step 4: Simplify right side
    661,647.60x = 406,620,693,431.28
  5. Step 5: Solve for x
    x = 406,620,693,431.28/661,647.60
  6. Step 6: Final answer
    x = 614,557.80

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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.