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Finding the Fourth Proportional to 156,978.06, 216,628.63 and 85,358.13

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Solution

The fourth proportional to 156,978.06, 216,628.63 and 85,358.13 is: 117,793.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,978.06 : 216,628.63 = 85,358.13 : x
  2. Step 2: Convert to fraction form
    156,978.06/216,628.63 = 85,358.13/x
  3. Step 3: Cross multiply
    156,978.06x = 216,628.63 × 85,358.13
  4. Step 4: Simplify right side
    156,978.06x = 18,491,014,761.26
  5. Step 5: Solve for x
    x = 18,491,014,761.26/156,978.06
  6. Step 6: Final answer
    x = 117,793.63

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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.