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Finding the Fourth Proportional to 1,398.70, 1,930.20 and 760.62

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Solution

The fourth proportional to 1,398.70, 1,930.20 and 760.62 is: 1,049.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.70 : 1,930.20 = 760.62 : x
  2. Step 2: Convert to fraction form
    1,398.70/1,930.20 = 760.62/x
  3. Step 3: Cross multiply
    1,398.70x = 1,930.20 × 760.62
  4. Step 4: Simplify right side
    1,398.70x = 1,468,153.70
  5. Step 5: Solve for x
    x = 1,468,153.70/1,398.70
  6. Step 6: Final answer
    x = 1,049.66

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1.5x scale

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.