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Finding the Fourth Proportional to 156,381.81, 215,807.28 and 84,761.76

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Solution

The fourth proportional to 156,381.81, 215,807.28 and 84,761.76 is: 116,971.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,381.81 : 215,807.28 = 84,761.76 : x
  2. Step 2: Convert to fraction form
    156,381.81/215,807.28 = 84,761.76/x
  3. Step 3: Cross multiply
    156,381.81x = 215,807.28 × 84,761.76
  4. Step 4: Simplify right side
    156,381.81x = 18,292,204,873.61
  5. Step 5: Solve for x
    x = 18,292,204,873.61/156,381.81
  6. Step 6: Final answer
    x = 116,971.44

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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.