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Finding the Fourth Proportional to 661,803.60, 991,534.20 and 639,877.20

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Solution

The fourth proportional to 661,803.60, 991,534.20 and 639,877.20 is: 958,683.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,803.60 : 991,534.20 = 639,877.20 : x
  2. Step 2: Convert to fraction form
    661,803.60/991,534.20 = 639,877.20/x
  3. Step 3: Cross multiply
    661,803.60x = 991,534.20 × 639,877.20
  4. Step 4: Simplify right side
    661,803.60x = 634,460,127,600.24
  5. Step 5: Solve for x
    x = 634,460,127,600.24/661,803.60
  6. Step 6: Final answer
    x = 958,683.40

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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.