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Finding the Fourth Proportional to 91,039.64, 136,559.44 and 28,715

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Solution

The fourth proportional to 91,039.64, 136,559.44 and 28,715 is: 43,072.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,039.64 : 136,559.44 = 28,715 : x
  2. Step 2: Convert to fraction form
    91,039.64/136,559.44 = 28,715/x
  3. Step 3: Cross multiply
    91,039.64x = 136,559.44 × 28,715
  4. Step 4: Simplify right side
    91,039.64x = 3,921,304,319.60
  5. Step 5: Solve for x
    x = 3,921,304,319.60/91,039.64
  6. Step 6: Final answer
    x = 43,072.49

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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.