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Finding the Fourth Proportional to 976.89, 1,348.59 and 663.81

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Solution

The fourth proportional to 976.89, 1,348.59 and 663.81 is: 916.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.89 : 1,348.59 = 663.81 : x
  2. Step 2: Convert to fraction form
    976.89/1,348.59 = 663.81/x
  3. Step 3: Cross multiply
    976.89x = 1,348.59 × 663.81
  4. Step 4: Simplify right side
    976.89x = 895,200.78
  5. Step 5: Solve for x
    x = 895,200.78/976.89
  6. Step 6: Final answer
    x = 916.38

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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.