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Finding the Fourth Proportional to 78,977.88, 108,918.90 and 65,527.84

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Solution

The fourth proportional to 78,977.88, 108,918.90 and 65,527.84 is: 90,369.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,977.88 : 108,918.90 = 65,527.84 : x
  2. Step 2: Convert to fraction form
    78,977.88/108,918.90 = 65,527.84/x
  3. Step 3: Cross multiply
    78,977.88x = 108,918.90 × 65,527.84
  4. Step 4: Simplify right side
    78,977.88x = 7,137,220,252.18
  5. Step 5: Solve for x
    x = 7,137,220,252.18/78,977.88
  6. Step 6: Final answer
    x = 90,369.86

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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.