Home / 1,145.15-1,580.30-621.18

Finding the Fourth Proportional to 1,145.15, 1,580.30 and 621.18

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Solution

The fourth proportional to 1,145.15, 1,580.30 and 621.18 is: 857.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.15 : 1,580.30 = 621.18 : x
  2. Step 2: Convert to fraction form
    1,145.15/1,580.30 = 621.18/x
  3. Step 3: Cross multiply
    1,145.15x = 1,580.30 × 621.18
  4. Step 4: Simplify right side
    1,145.15x = 981,647.65
  5. Step 5: Solve for x
    x = 981,647.65/1,145.15
  6. Step 6: Final answer
    x = 857.23

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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.