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Finding the Fourth Proportional to 103,679.40, 155,489.94 and 28,781.40

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Solution

The fourth proportional to 103,679.40, 155,489.94 and 28,781.40 is: 43,164.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,679.40 : 155,489.94 = 28,781.40 : x
  2. Step 2: Convert to fraction form
    103,679.40/155,489.94 = 28,781.40/x
  3. Step 3: Cross multiply
    103,679.40x = 155,489.94 × 28,781.40
  4. Step 4: Simplify right side
    103,679.40x = 4,475,218,159.12
  5. Step 5: Solve for x
    x = 4,475,218,159.12/103,679.40
  6. Step 6: Final answer
    x = 43,164.01

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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.