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Finding the Fourth Proportional to 1,145.85, 1,581.28 and 621.88

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Solution

The fourth proportional to 1,145.85, 1,581.28 and 621.88 is: 858.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.85 : 1,581.28 = 621.88 : x
  2. Step 2: Convert to fraction form
    1,145.85/1,581.28 = 621.88/x
  3. Step 3: Cross multiply
    1,145.85x = 1,581.28 × 621.88
  4. Step 4: Simplify right side
    1,145.85x = 983,360.90
  5. Step 5: Solve for x
    x = 983,360.90/1,145.85
  6. Step 6: Final answer
    x = 858.20

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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.