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Finding the Fourth Proportional to 763.76, 1,053.20 and 686.26

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Solution

The fourth proportional to 763.76, 1,053.20 and 686.26 is: 946.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.76 : 1,053.20 = 686.26 : x
  2. Step 2: Convert to fraction form
    763.76/1,053.20 = 686.26/x
  3. Step 3: Cross multiply
    763.76x = 1,053.20 × 686.26
  4. Step 4: Simplify right side
    763.76x = 722,769.03
  5. Step 5: Solve for x
    x = 722,769.03/763.76
  6. Step 6: Final answer
    x = 946.33

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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.