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Finding the Fourth Proportional to 717.20, 1,075.86 and 284.26

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Solution

The fourth proportional to 717.20, 1,075.86 and 284.26 is: 426.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.20 : 1,075.86 = 284.26 : x
  2. Step 2: Convert to fraction form
    717.20/1,075.86 = 284.26/x
  3. Step 3: Cross multiply
    717.20x = 1,075.86 × 284.26
  4. Step 4: Simplify right side
    717.20x = 305,823.96
  5. Step 5: Solve for x
    x = 305,823.96/717.20
  6. Step 6: Final answer
    x = 426.41

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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.