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Finding the Fourth Proportional to 717.20, 1,075.78 and 388.28

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Solution

The fourth proportional to 717.20, 1,075.78 and 388.28 is: 582.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.20 : 1,075.78 = 388.28 : x
  2. Step 2: Convert to fraction form
    717.20/1,075.78 = 388.28/x
  3. Step 3: Cross multiply
    717.20x = 1,075.78 × 388.28
  4. Step 4: Simplify right side
    717.20x = 417,703.86
  5. Step 5: Solve for x
    x = 417,703.86/717.20
  6. Step 6: Final answer
    x = 582.41

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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.