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Finding the Fourth Proportional to 976.38, 1,345.10 and 681.12

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Solution

The fourth proportional to 976.38, 1,345.10 and 681.12 is: 938.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.38 : 1,345.10 = 681.12 : x
  2. Step 2: Convert to fraction form
    976.38/1,345.10 = 681.12/x
  3. Step 3: Cross multiply
    976.38x = 1,345.10 × 681.12
  4. Step 4: Simplify right side
    976.38x = 916,174.51
  5. Step 5: Solve for x
    x = 916,174.51/976.38
  6. Step 6: Final answer
    x = 938.34

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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.