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Finding the Fourth Proportional to 815.50, 1,125.43 and 479.62

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Solution

The fourth proportional to 815.50, 1,125.43 and 479.62 is: 661.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.50 : 1,125.43 = 479.62 : x
  2. Step 2: Convert to fraction form
    815.50/1,125.43 = 479.62/x
  3. Step 3: Cross multiply
    815.50x = 1,125.43 × 479.62
  4. Step 4: Simplify right side
    815.50x = 539,778.94
  5. Step 5: Solve for x
    x = 539,778.94/815.50
  6. Step 6: Final answer
    x = 661.90

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.