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Finding the Fourth Proportional to 885.43, 1,220.76 and 683.74

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Solution

The fourth proportional to 885.43, 1,220.76 and 683.74 is: 942.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.43 : 1,220.76 = 683.74 : x
  2. Step 2: Convert to fraction form
    885.43/1,220.76 = 683.74/x
  3. Step 3: Cross multiply
    885.43x = 1,220.76 × 683.74
  4. Step 4: Simplify right side
    885.43x = 834,679.39
  5. Step 5: Solve for x
    x = 834,679.39/885.43
  6. Step 6: Final answer
    x = 942.69

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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.