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Finding the Fourth Proportional to 91,638.80, 137,479.72 and 28,455.66

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Solution

The fourth proportional to 91,638.80, 137,479.72 and 28,455.66 is: 42,690.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,638.80 : 137,479.72 = 28,455.66 : x
  2. Step 2: Convert to fraction form
    91,638.80/137,479.72 = 28,455.66/x
  3. Step 3: Cross multiply
    91,638.80x = 137,479.72 × 28,455.66
  4. Step 4: Simplify right side
    91,638.80x = 3,912,076,169.22
  5. Step 5: Solve for x
    x = 3,912,076,169.22/91,638.80
  6. Step 6: Final answer
    x = 42,690.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.