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Finding the Fourth Proportional to 230,930.15, 318,655.51 and 128,961.28

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Solution

The fourth proportional to 230,930.15, 318,655.51 and 128,961.28 is: 177,950.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    230,930.15 : 318,655.51 = 128,961.28 : x
  2. Step 2: Convert to fraction form
    230,930.15/318,655.51 = 128,961.28/x
  3. Step 3: Cross multiply
    230,930.15x = 318,655.51 × 128,961.28
  4. Step 4: Simplify right side
    230,930.15x = 41,094,221,329.61
  5. Step 5: Solve for x
    x = 41,094,221,329.61/230,930.15
  6. Step 6: Final answer
    x = 177,950.87

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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.