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Finding the Fourth Proportional to 66,689.28, 91,646.28 and 63,605.52

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Solution

The fourth proportional to 66,689.28, 91,646.28 and 63,605.52 is: 87,408.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,689.28 : 91,646.28 = 63,605.52 : x
  2. Step 2: Convert to fraction form
    66,689.28/91,646.28 = 63,605.52/x
  3. Step 3: Cross multiply
    66,689.28x = 91,646.28 × 63,605.52
  4. Step 4: Simplify right side
    66,689.28x = 5,829,209,295.47
  5. Step 5: Solve for x
    x = 5,829,209,295.47/66,689.28
  6. Step 6: Final answer
    x = 87,408.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.