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Finding the Fourth Proportional to 763.96, 1,140.40 and 671.70

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Solution

The fourth proportional to 763.96, 1,140.40 and 671.70 is: 1,002.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.96 : 1,140.40 = 671.70 : x
  2. Step 2: Convert to fraction form
    763.96/1,140.40 = 671.70/x
  3. Step 3: Cross multiply
    763.96x = 1,140.40 × 671.70
  4. Step 4: Simplify right side
    763.96x = 766,006.68
  5. Step 5: Solve for x
    x = 766,006.68/763.96
  6. Step 6: Final answer
    x = 1,002.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.