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Finding the Fourth Proportional to 103,920.40, 155,661.90 and 86,424.40

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Solution

The fourth proportional to 103,920.40, 155,661.90 and 86,424.40 is: 129,454.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,920.40 : 155,661.90 = 86,424.40 : x
  2. Step 2: Convert to fraction form
    103,920.40/155,661.90 = 86,424.40/x
  3. Step 3: Cross multiply
    103,920.40x = 155,661.90 × 86,424.40
  4. Step 4: Simplify right side
    103,920.40x = 13,452,986,310.36
  5. Step 5: Solve for x
    x = 13,452,986,310.36/103,920.40
  6. Step 6: Final answer
    x = 129,454.72

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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.