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Finding the Fourth Proportional to 1,146.78, 1,582.50 and 681

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Solution

The fourth proportional to 1,146.78, 1,582.50 and 681 is: 939.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,146.78 : 1,582.50 = 681 : x
  2. Step 2: Convert to fraction form
    1,146.78/1,582.50 = 681/x
  3. Step 3: Cross multiply
    1,146.78x = 1,582.50 × 681
  4. Step 4: Simplify right side
    1,146.78x = 1,077,682.50
  5. Step 5: Solve for x
    x = 1,077,682.50/1,146.78
  6. Step 6: Final answer
    x = 939.75

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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.