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Finding the Fourth Proportional to 1,440.64, 2,161.20 and 574.48

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Solution

The fourth proportional to 1,440.64, 2,161.20 and 574.48 is: 861.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.64 : 2,161.20 = 574.48 : x
  2. Step 2: Convert to fraction form
    1,440.64/2,161.20 = 574.48/x
  3. Step 3: Cross multiply
    1,440.64x = 2,161.20 × 574.48
  4. Step 4: Simplify right side
    1,440.64x = 1,241,566.18
  5. Step 5: Solve for x
    x = 1,241,566.18/1,440.64
  6. Step 6: Final answer
    x = 861.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.