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Finding the Fourth Proportional to 818.56, 1,132.14 and 643.26

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Solution

The fourth proportional to 818.56, 1,132.14 and 643.26 is: 889.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.56 : 1,132.14 = 643.26 : x
  2. Step 2: Convert to fraction form
    818.56/1,132.14 = 643.26/x
  3. Step 3: Cross multiply
    818.56x = 1,132.14 × 643.26
  4. Step 4: Simplify right side
    818.56x = 728,260.38
  5. Step 5: Solve for x
    x = 728,260.38/818.56
  6. Step 6: Final answer
    x = 889.68

Related Problems

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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.