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Finding the Fourth Proportional to 1,098.56, 1,513.40 and 766.38

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Solution

The fourth proportional to 1,098.56, 1,513.40 and 766.38 is: 1,055.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.56 : 1,513.40 = 766.38 : x
  2. Step 2: Convert to fraction form
    1,098.56/1,513.40 = 766.38/x
  3. Step 3: Cross multiply
    1,098.56x = 1,513.40 × 766.38
  4. Step 4: Simplify right side
    1,098.56x = 1,159,839.49
  5. Step 5: Solve for x
    x = 1,159,839.49/1,098.56
  6. Step 6: Final answer
    x = 1,055.78

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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.