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Finding the Fourth Proportional to 156,965.61, 216,611.42 and 85,345.61

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Solution

The fourth proportional to 156,965.61, 216,611.42 and 85,345.61 is: 117,776.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,965.61 : 216,611.42 = 85,345.61 : x
  2. Step 2: Convert to fraction form
    156,965.61/216,611.42 = 85,345.61/x
  3. Step 3: Cross multiply
    156,965.61x = 216,611.42 × 85,345.61
  4. Step 4: Simplify right side
    156,965.61x = 18,486,834,527.76
  5. Step 5: Solve for x
    x = 18,486,834,527.76/156,965.61
  6. Step 6: Final answer
    x = 117,776.34

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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.