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Finding the Fourth Proportional to 815.45, 1,223.17 and 424.49

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Solution

The fourth proportional to 815.45, 1,223.17 and 424.49 is: 636.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.45 : 1,223.17 = 424.49 : x
  2. Step 2: Convert to fraction form
    815.45/1,223.17 = 424.49/x
  3. Step 3: Cross multiply
    815.45x = 1,223.17 × 424.49
  4. Step 4: Simplify right side
    815.45x = 519,216.26
  5. Step 5: Solve for x
    x = 519,216.26/815.45
  6. Step 6: Final answer
    x = 636.73

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.