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Finding the Fourth Proportional to 1,211.34, 1,671.12 and 818.22

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Solution

The fourth proportional to 1,211.34, 1,671.12 and 818.22 is: 1,128.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.34 : 1,671.12 = 818.22 : x
  2. Step 2: Convert to fraction form
    1,211.34/1,671.12 = 818.22/x
  3. Step 3: Cross multiply
    1,211.34x = 1,671.12 × 818.22
  4. Step 4: Simplify right side
    1,211.34x = 1,367,343.81
  5. Step 5: Solve for x
    x = 1,367,343.81/1,211.34
  6. Step 6: Final answer
    x = 1,128.79

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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.