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Finding the Fourth Proportional to 215,155, 296,913.90 and 125,731

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Solution

The fourth proportional to 215,155, 296,913.90 and 125,731 is: 173,508.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,155 : 296,913.90 = 125,731 : x
  2. Step 2: Convert to fraction form
    215,155/296,913.90 = 125,731/x
  3. Step 3: Cross multiply
    215,155x = 296,913.90 × 125,731
  4. Step 4: Simplify right side
    215,155x = 37,331,281,560.90
  5. Step 5: Solve for x
    x = 37,331,281,560.90/215,155
  6. Step 6: Final answer
    x = 173,508.78

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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.