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Finding the Fourth Proportional to 1,145.67, 1,581.03 and 621.70

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Solution

The fourth proportional to 1,145.67, 1,581.03 and 621.70 is: 857.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.67 : 1,581.03 = 621.70 : x
  2. Step 2: Convert to fraction form
    1,145.67/1,581.03 = 621.70/x
  3. Step 3: Cross multiply
    1,145.67x = 1,581.03 × 621.70
  4. Step 4: Simplify right side
    1,145.67x = 982,929.54
  5. Step 5: Solve for x
    x = 982,929.54/1,145.67
  6. Step 6: Final answer
    x = 857.95

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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.