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Finding the Fourth Proportional to 812.25, 1,120.95 and 480.87

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Solution

The fourth proportional to 812.25, 1,120.95 and 480.87 is: 663.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.25 : 1,120.95 = 480.87 : x
  2. Step 2: Convert to fraction form
    812.25/1,120.95 = 480.87/x
  3. Step 3: Cross multiply
    812.25x = 1,120.95 × 480.87
  4. Step 4: Simplify right side
    812.25x = 539,031.23
  5. Step 5: Solve for x
    x = 539,031.23/812.25
  6. Step 6: Final answer
    x = 663.63

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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.