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Finding the Fourth Proportional to 78,232.72, 107,960.88 and 42,422.64

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Solution

The fourth proportional to 78,232.72, 107,960.88 and 42,422.64 is: 58,543.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,232.72 : 107,960.88 = 42,422.64 : x
  2. Step 2: Convert to fraction form
    78,232.72/107,960.88 = 42,422.64/x
  3. Step 3: Cross multiply
    78,232.72x = 107,960.88 × 42,422.64
  4. Step 4: Simplify right side
    78,232.72x = 4,579,985,546.32
  5. Step 5: Solve for x
    x = 4,579,985,546.32/78,232.72
  6. Step 6: Final answer
    x = 58,543.09

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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.