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Finding the Fourth Proportional to 1,043.60, 1,440.15 and 571.49

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Solution

The fourth proportional to 1,043.60, 1,440.15 and 571.49 is: 788.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.60 : 1,440.15 = 571.49 : x
  2. Step 2: Convert to fraction form
    1,043.60/1,440.15 = 571.49/x
  3. Step 3: Cross multiply
    1,043.60x = 1,440.15 × 571.49
  4. Step 4: Simplify right side
    1,043.60x = 823,021.27
  5. Step 5: Solve for x
    x = 823,021.27/1,043.60
  6. Step 6: Final answer
    x = 788.64

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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.