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Finding the Fourth Proportional to 103,978.20, 155,215.14 and 91,366.90

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Solution

The fourth proportional to 103,978.20, 155,215.14 and 91,366.90 is: 136,389.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,978.20 : 155,215.14 = 91,366.90 : x
  2. Step 2: Convert to fraction form
    103,978.20/155,215.14 = 91,366.90/x
  3. Step 3: Cross multiply
    103,978.20x = 155,215.14 × 91,366.90
  4. Step 4: Simplify right side
    103,978.20x = 14,181,526,174.87
  5. Step 5: Solve for x
    x = 14,181,526,174.87/103,978.20
  6. Step 6: Final answer
    x = 136,389.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.