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Finding the Fourth Proportional to 1,043.50, 1,440.21 and 629.50

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Solution

The fourth proportional to 1,043.50, 1,440.21 and 629.50 is: 868.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.50 : 1,440.21 = 629.50 : x
  2. Step 2: Convert to fraction form
    1,043.50/1,440.21 = 629.50/x
  3. Step 3: Cross multiply
    1,043.50x = 1,440.21 × 629.50
  4. Step 4: Simplify right side
    1,043.50x = 906,612.20
  5. Step 5: Solve for x
    x = 906,612.20/1,043.50
  6. Step 6: Final answer
    x = 868.82

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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.