Home / 1,145.40-1,580.65-621.43

Finding the Fourth Proportional to 1,145.40, 1,580.65 and 621.43

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Solution

The fourth proportional to 1,145.40, 1,580.65 and 621.43 is: 857.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.40 : 1,580.65 = 621.43 : x
  2. Step 2: Convert to fraction form
    1,145.40/1,580.65 = 621.43/x
  3. Step 3: Cross multiply
    1,145.40x = 1,580.65 × 621.43
  4. Step 4: Simplify right side
    1,145.40x = 982,257.82
  5. Step 5: Solve for x
    x = 982,257.82/1,145.40
  6. Step 6: Final answer
    x = 857.57

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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.