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Finding the Fourth Proportional to 812.34, 1,120.86 and 462.96

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Solution

The fourth proportional to 812.34, 1,120.86 and 462.96 is: 638.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.34 : 1,120.86 = 462.96 : x
  2. Step 2: Convert to fraction form
    812.34/1,120.86 = 462.96/x
  3. Step 3: Cross multiply
    812.34x = 1,120.86 × 462.96
  4. Step 4: Simplify right side
    812.34x = 518,913.35
  5. Step 5: Solve for x
    x = 518,913.35/812.34
  6. Step 6: Final answer
    x = 638.79

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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.