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Finding the Fourth Proportional to 156,658.72, 216,191.28 and 85,038.88

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Solution

The fourth proportional to 156,658.72, 216,191.28 and 85,038.88 is: 117,354.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,658.72 : 216,191.28 = 85,038.88 : x
  2. Step 2: Convert to fraction form
    156,658.72/216,191.28 = 85,038.88/x
  3. Step 3: Cross multiply
    156,658.72x = 216,191.28 × 85,038.88
  4. Step 4: Simplify right side
    156,658.72x = 18,384,664,316.97
  5. Step 5: Solve for x
    x = 18,384,664,316.97/156,658.72
  6. Step 6: Final answer
    x = 117,354.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.