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Finding the Fourth Proportional to 91,319.76, 136,980 and 28,139.40

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Solution

The fourth proportional to 91,319.76, 136,980 and 28,139.40 is: 42,209.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,319.76 : 136,980 = 28,139.40 : x
  2. Step 2: Convert to fraction form
    91,319.76/136,980 = 28,139.40/x
  3. Step 3: Cross multiply
    91,319.76x = 136,980 × 28,139.40
  4. Step 4: Simplify right side
    91,319.76x = 3,854,535,012
  5. Step 5: Solve for x
    x = 3,854,535,012/91,319.76
  6. Step 6: Final answer
    x = 42,209.21

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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.