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Finding the Fourth Proportional to 112,688.62, 155,615.64 and 72,472.20

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Solution

The fourth proportional to 112,688.62, 155,615.64 and 72,472.20 is: 100,079.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,688.62 : 155,615.64 = 72,472.20 : x
  2. Step 2: Convert to fraction form
    112,688.62/155,615.64 = 72,472.20/x
  3. Step 3: Cross multiply
    112,688.62x = 155,615.64 × 72,472.20
  4. Step 4: Simplify right side
    112,688.62x = 11,277,807,785.21
  5. Step 5: Solve for x
    x = 11,277,807,785.21/112,688.62
  6. Step 6: Final answer
    x = 100,079.38

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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.