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Finding the Fourth Proportional to 156,908.80, 216,583.68 and 100,320.40

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Solution

The fourth proportional to 156,908.80, 216,583.68 and 100,320.40 is: 138,473.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,908.80 : 216,583.68 = 100,320.40 : x
  2. Step 2: Convert to fraction form
    156,908.80/216,583.68 = 100,320.40/x
  3. Step 3: Cross multiply
    156,908.80x = 216,583.68 × 100,320.40
  4. Step 4: Simplify right side
    156,908.80x = 21,727,761,411.07
  5. Step 5: Solve for x
    x = 21,727,761,411.07/156,908.80
  6. Step 6: Final answer
    x = 138,473.82

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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.