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Finding the Fourth Proportional to 56,679.38, 78,218 and 31,528.88

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Solution

The fourth proportional to 56,679.38, 78,218 and 31,528.88 is: 43,510.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,679.38 : 78,218 = 31,528.88 : x
  2. Step 2: Convert to fraction form
    56,679.38/78,218 = 31,528.88/x
  3. Step 3: Cross multiply
    56,679.38x = 78,218 × 31,528.88
  4. Step 4: Simplify right side
    56,679.38x = 2,466,125,935.84
  5. Step 5: Solve for x
    x = 2,466,125,935.84/56,679.38
  6. Step 6: Final answer
    x = 43,510.11

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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.