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Finding the Fourth Proportional to 815.50, 1,125.59 and 479.48

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Solution

The fourth proportional to 815.50, 1,125.59 and 479.48 is: 661.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.50 : 1,125.59 = 479.48 : x
  2. Step 2: Convert to fraction form
    815.50/1,125.59 = 479.48/x
  3. Step 3: Cross multiply
    815.50x = 1,125.59 × 479.48
  4. Step 4: Simplify right side
    815.50x = 539,694.38
  5. Step 5: Solve for x
    x = 539,694.38/815.50
  6. Step 6: Final answer
    x = 661.79

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1.5x scale

Why These Related Problems?

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