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Finding the Fourth Proportional to 154,886.72, 213,718.30 and 91,215.86

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Solution

The fourth proportional to 154,886.72, 213,718.30 and 91,215.86 is: 125,862.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,886.72 : 213,718.30 = 91,215.86 : x
  2. Step 2: Convert to fraction form
    154,886.72/213,718.30 = 91,215.86/x
  3. Step 3: Cross multiply
    154,886.72x = 213,718.30 × 91,215.86
  4. Step 4: Simplify right side
    154,886.72x = 19,494,497,235.61
  5. Step 5: Solve for x
    x = 19,494,497,235.61/154,886.72
  6. Step 6: Final answer
    x = 125,862.94

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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.