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Finding the Fourth Proportional to 976.76, 1,345.09 and 681.51

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Solution

The fourth proportional to 976.76, 1,345.09 and 681.51 is: 938.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.76 : 1,345.09 = 681.51 : x
  2. Step 2: Convert to fraction form
    976.76/1,345.09 = 681.51/x
  3. Step 3: Cross multiply
    976.76x = 1,345.09 × 681.51
  4. Step 4: Simplify right side
    976.76x = 916,688.88
  5. Step 5: Solve for x
    x = 916,688.88/976.76
  6. Step 6: Final answer
    x = 938.50

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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.