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Finding the Fourth Proportional to 815.20, 1,124.10 and 552.76

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Solution

The fourth proportional to 815.20, 1,124.10 and 552.76 is: 762.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.20 : 1,124.10 = 552.76 : x
  2. Step 2: Convert to fraction form
    815.20/1,124.10 = 552.76/x
  3. Step 3: Cross multiply
    815.20x = 1,124.10 × 552.76
  4. Step 4: Simplify right side
    815.20x = 621,357.52
  5. Step 5: Solve for x
    x = 621,357.52/815.20
  6. Step 6: Final answer
    x = 762.21

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Half scale
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Double scale
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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.