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Finding the Fourth Proportional to 1,145.44, 1,580.72 and 621.48

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Solution

The fourth proportional to 1,145.44, 1,580.72 and 621.48 is: 857.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.44 : 1,580.72 = 621.48 : x
  2. Step 2: Convert to fraction form
    1,145.44/1,580.72 = 621.48/x
  3. Step 3: Cross multiply
    1,145.44x = 1,580.72 × 621.48
  4. Step 4: Simplify right side
    1,145.44x = 982,385.87
  5. Step 5: Solve for x
    x = 982,385.87/1,145.44
  6. Step 6: Final answer
    x = 857.65

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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.