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Finding the Fourth Proportional to 812.76, 1,121.78 and 517.96

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Solution

The fourth proportional to 812.76, 1,121.78 and 517.96 is: 714.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.76 : 1,121.78 = 517.96 : x
  2. Step 2: Convert to fraction form
    812.76/1,121.78 = 517.96/x
  3. Step 3: Cross multiply
    812.76x = 1,121.78 × 517.96
  4. Step 4: Simplify right side
    812.76x = 581,037.17
  5. Step 5: Solve for x
    x = 581,037.17/812.76
  6. Step 6: Final answer
    x = 714.89

Related Problems

Find fourth proportional to 406.38, 560.89 and 258.98
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.