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Finding the Fourth Proportional to 103,695.67, 155,543.40 and 28,815.78

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Solution

The fourth proportional to 103,695.67, 155,543.40 and 28,815.78 is: 43,223.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,695.67 : 155,543.40 = 28,815.78 : x
  2. Step 2: Convert to fraction form
    103,695.67/155,543.40 = 28,815.78/x
  3. Step 3: Cross multiply
    103,695.67x = 155,543.40 × 28,815.78
  4. Step 4: Simplify right side
    103,695.67x = 4,482,104,394.85
  5. Step 5: Solve for x
    x = 4,482,104,394.85/103,695.67
  6. Step 6: Final answer
    x = 43,223.64

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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.