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Finding the Fourth Proportional to 91,390.48, 136,928.88 and 82,145.95

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Solution

The fourth proportional to 91,390.48, 136,928.88 and 82,145.95 is: 123,077.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,390.48 : 136,928.88 = 82,145.95 : x
  2. Step 2: Convert to fraction form
    91,390.48/136,928.88 = 82,145.95/x
  3. Step 3: Cross multiply
    91,390.48x = 136,928.88 × 82,145.95
  4. Step 4: Simplify right side
    91,390.48x = 11,248,152,587.71
  5. Step 5: Solve for x
    x = 11,248,152,587.71/91,390.48
  6. Step 6: Final answer
    x = 123,077.95

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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.