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Finding the Fourth Proportional to 812.76, 1,121.43 and 458.64

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Solution

The fourth proportional to 812.76, 1,121.43 and 458.64 is: 632.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.76 : 1,121.43 = 458.64 : x
  2. Step 2: Convert to fraction form
    812.76/1,121.43 = 458.64/x
  3. Step 3: Cross multiply
    812.76x = 1,121.43 × 458.64
  4. Step 4: Simplify right side
    812.76x = 514,332.66
  5. Step 5: Solve for x
    x = 514,332.66/812.76
  6. Step 6: Final answer
    x = 632.82

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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.