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Finding the Fourth Proportional to 103,584.80, 155,377.20 and 85,870.10

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Solution

The fourth proportional to 103,584.80, 155,377.20 and 85,870.10 is: 128,805.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,584.80 : 155,377.20 = 85,870.10 : x
  2. Step 2: Convert to fraction form
    103,584.80/155,377.20 = 85,870.10/x
  3. Step 3: Cross multiply
    103,584.80x = 155,377.20 × 85,870.10
  4. Step 4: Simplify right side
    103,584.80x = 13,342,255,701.72
  5. Step 5: Solve for x
    x = 13,342,255,701.72/103,584.80
  6. Step 6: Final answer
    x = 128,805.15

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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.