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Finding the Fourth Proportional to 1,145.88, 1,581.31 and 621.91

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Solution

The fourth proportional to 1,145.88, 1,581.31 and 621.91 is: 858.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.88 : 1,581.31 = 621.91 : x
  2. Step 2: Convert to fraction form
    1,145.88/1,581.31 = 621.91/x
  3. Step 3: Cross multiply
    1,145.88x = 1,581.31 × 621.91
  4. Step 4: Simplify right side
    1,145.88x = 983,432.08
  5. Step 5: Solve for x
    x = 983,432.08/1,145.88
  6. Step 6: Final answer
    x = 858.23

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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.