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Finding the Fourth Proportional to 78,126.88, 107,815.08 and 42,316.60

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Solution

The fourth proportional to 78,126.88, 107,815.08 and 42,316.60 is: 58,396.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,126.88 : 107,815.08 = 42,316.60 : x
  2. Step 2: Convert to fraction form
    78,126.88/107,815.08 = 42,316.60/x
  3. Step 3: Cross multiply
    78,126.88x = 107,815.08 × 42,316.60
  4. Step 4: Simplify right side
    78,126.88x = 4,562,367,614.33
  5. Step 5: Solve for x
    x = 4,562,367,614.33/78,126.88
  6. Step 6: Final answer
    x = 58,396.90

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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.