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Finding the Fourth Proportional to 763.61, 1,139.55 and 681.59

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Solution

The fourth proportional to 763.61, 1,139.55 and 681.59 is: 1,017.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.61 : 1,139.55 = 681.59 : x
  2. Step 2: Convert to fraction form
    763.61/1,139.55 = 681.59/x
  3. Step 3: Cross multiply
    763.61x = 1,139.55 × 681.59
  4. Step 4: Simplify right side
    763.61x = 776,700.19
  5. Step 5: Solve for x
    x = 776,700.19/763.61
  6. Step 6: Final answer
    x = 1,017.15

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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.