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Finding the Fourth Proportional to 661,807.60, 991,540.20 and 639,881.20

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Solution

The fourth proportional to 661,807.60, 991,540.20 and 639,881.20 is: 958,689.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,807.60 : 991,540.20 = 639,881.20 : x
  2. Step 2: Convert to fraction form
    661,807.60/991,540.20 = 639,881.20/x
  3. Step 3: Cross multiply
    661,807.60x = 991,540.20 × 639,881.20
  4. Step 4: Simplify right side
    661,807.60x = 634,467,933,024.24
  5. Step 5: Solve for x
    x = 634,467,933,024.24/661,807.60
  6. Step 6: Final answer
    x = 958,689.40

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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.