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Finding the Fourth Proportional to 78,988.01, 108,932.87 and 65,537.96

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Solution

The fourth proportional to 78,988.01, 108,932.87 and 65,537.96 is: 90,383.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,988.01 : 108,932.87 = 65,537.96 : x
  2. Step 2: Convert to fraction form
    78,988.01/108,932.87 = 65,537.96/x
  3. Step 3: Cross multiply
    78,988.01x = 108,932.87 × 65,537.96
  4. Step 4: Simplify right side
    78,988.01x = 7,139,237,695.93
  5. Step 5: Solve for x
    x = 7,139,237,695.93/78,988.01
  6. Step 6: Final answer
    x = 90,383.82

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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.