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Finding the Fourth Proportional to 812.73, 1,115.70 and 747.12

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Solution

The fourth proportional to 812.73, 1,115.70 and 747.12 is: 1,025.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.73 : 1,115.70 = 747.12 : x
  2. Step 2: Convert to fraction form
    812.73/1,115.70 = 747.12/x
  3. Step 3: Cross multiply
    812.73x = 1,115.70 × 747.12
  4. Step 4: Simplify right side
    812.73x = 833,561.78
  5. Step 5: Solve for x
    x = 833,561.78/812.73
  6. Step 6: Final answer
    x = 1,025.63

Related Problems

Find fourth proportional to 406.37, 557.85 and 373.56
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 (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.