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Finding the Fourth Proportional to 1,001.79, 1,382.85 and 688.68

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Solution

The fourth proportional to 1,001.79, 1,382.85 and 688.68 is: 950.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.79 : 1,382.85 = 688.68 : x
  2. Step 2: Convert to fraction form
    1,001.79/1,382.85 = 688.68/x
  3. Step 3: Cross multiply
    1,001.79x = 1,382.85 × 688.68
  4. Step 4: Simplify right side
    1,001.79x = 952,341.14
  5. Step 5: Solve for x
    x = 952,341.14/1,001.79
  6. Step 6: Final answer
    x = 950.64

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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.