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Finding the Fourth Proportional to 91,139.28, 136,708.10 and 28,809.80

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Solution

The fourth proportional to 91,139.28, 136,708.10 and 28,809.80 is: 43,214.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,139.28 : 136,708.10 = 28,809.80 : x
  2. Step 2: Convert to fraction form
    91,139.28/136,708.10 = 28,809.80/x
  3. Step 3: Cross multiply
    91,139.28x = 136,708.10 × 28,809.80
  4. Step 4: Simplify right side
    91,139.28x = 3,938,533,019.38
  5. Step 5: Solve for x
    x = 3,938,533,019.38/91,139.28
  6. Step 6: Final answer
    x = 43,214.44

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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.