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Finding the Fourth Proportional to 820.61, 1,131.17 and 654.56

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Solution

The fourth proportional to 820.61, 1,131.17 and 654.56 is: 902.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.61 : 1,131.17 = 654.56 : x
  2. Step 2: Convert to fraction form
    820.61/1,131.17 = 654.56/x
  3. Step 3: Cross multiply
    820.61x = 1,131.17 × 654.56
  4. Step 4: Simplify right side
    820.61x = 740,409.71
  5. Step 5: Solve for x
    x = 740,409.71/820.61
  6. Step 6: Final answer
    x = 902.27

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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.