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Finding the Fourth Proportional to 1,358.74, 1,875.05 and 769.39

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Solution

The fourth proportional to 1,358.74, 1,875.05 and 769.39 is: 1,061.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.74 : 1,875.05 = 769.39 : x
  2. Step 2: Convert to fraction form
    1,358.74/1,875.05 = 769.39/x
  3. Step 3: Cross multiply
    1,358.74x = 1,875.05 × 769.39
  4. Step 4: Simplify right side
    1,358.74x = 1,442,640.87
  5. Step 5: Solve for x
    x = 1,442,640.87/1,358.74
  6. Step 6: Final answer
    x = 1,061.75

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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.