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Finding the Fourth Proportional to 1,146.78, 1,726.88 and 824.40

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Solution

The fourth proportional to 1,146.78, 1,726.88 and 824.40 is: 1,241.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,146.78 : 1,726.88 = 824.40 : x
  2. Step 2: Convert to fraction form
    1,146.78/1,726.88 = 824.40/x
  3. Step 3: Cross multiply
    1,146.78x = 1,726.88 × 824.40
  4. Step 4: Simplify right side
    1,146.78x = 1,423,639.87
  5. Step 5: Solve for x
    x = 1,423,639.87/1,146.78
  6. Step 6: Final answer
    x = 1,241.42

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.