Home / 1,145.12-1,580.26-621.15

Finding the Fourth Proportional to 1,145.12, 1,580.26 and 621.15

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Solution

The fourth proportional to 1,145.12, 1,580.26 and 621.15 is: 857.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.12 : 1,580.26 = 621.15 : x
  2. Step 2: Convert to fraction form
    1,145.12/1,580.26 = 621.15/x
  3. Step 3: Cross multiply
    1,145.12x = 1,580.26 × 621.15
  4. Step 4: Simplify right side
    1,145.12x = 981,578.50
  5. Step 5: Solve for x
    x = 981,578.50/1,145.12
  6. Step 6: Final answer
    x = 857.18

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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.