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Finding the Fourth Proportional to 78,216.54, 107,938.48 and 42,406.44

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Solution

The fourth proportional to 78,216.54, 107,938.48 and 42,406.44 is: 58,520.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,216.54 : 107,938.48 = 42,406.44 : x
  2. Step 2: Convert to fraction form
    78,216.54/107,938.48 = 42,406.44/x
  3. Step 3: Cross multiply
    78,216.54x = 107,938.48 × 42,406.44
  4. Step 4: Simplify right side
    78,216.54x = 4,577,286,675.81
  5. Step 5: Solve for x
    x = 4,577,286,675.81/78,216.54
  6. Step 6: Final answer
    x = 58,520.70

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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.