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Finding the Fourth Proportional to 976.32, 1,344.96 and 665.28

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Solution

The fourth proportional to 976.32, 1,344.96 and 665.28 is: 916.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.32 : 1,344.96 = 665.28 : x
  2. Step 2: Convert to fraction form
    976.32/1,344.96 = 665.28/x
  3. Step 3: Cross multiply
    976.32x = 1,344.96 × 665.28
  4. Step 4: Simplify right side
    976.32x = 894,774.99
  5. Step 5: Solve for x
    x = 894,774.99/976.32
  6. Step 6: Final answer
    x = 916.48

Related Problems

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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.