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Finding the Fourth Proportional to 154,887.72, 213,719.68 and 91,216.86

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Solution

The fourth proportional to 154,887.72, 213,719.68 and 91,216.86 is: 125,864.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,887.72 : 213,719.68 = 91,216.86 : x
  2. Step 2: Convert to fraction form
    154,887.72/213,719.68 = 91,216.86/x
  3. Step 3: Cross multiply
    154,887.72x = 213,719.68 × 91,216.86
  4. Step 4: Simplify right side
    154,887.72x = 19,494,838,129.80
  5. Step 5: Solve for x
    x = 19,494,838,129.80/154,887.72
  6. Step 6: Final answer
    x = 125,864.32

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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.