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Finding the Fourth Proportional to 1,145.95, 1,581.39 and 621.97

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Solution

The fourth proportional to 1,145.95, 1,581.39 and 621.97 is: 858.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.95 : 1,581.39 = 621.97 : x
  2. Step 2: Convert to fraction form
    1,145.95/1,581.39 = 621.97/x
  3. Step 3: Cross multiply
    1,145.95x = 1,581.39 × 621.97
  4. Step 4: Simplify right side
    1,145.95x = 983,577.14
  5. Step 5: Solve for x
    x = 983,577.14/1,145.95
  6. Step 6: Final answer
    x = 858.31

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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.