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Finding the Fourth Proportional to 717.32, 1,075.38 and 284.78

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Solution

The fourth proportional to 717.32, 1,075.38 and 284.78 is: 426.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.32 : 1,075.38 = 284.78 : x
  2. Step 2: Convert to fraction form
    717.32/1,075.38 = 284.78/x
  3. Step 3: Cross multiply
    717.32x = 1,075.38 × 284.78
  4. Step 4: Simplify right side
    717.32x = 306,246.72
  5. Step 5: Solve for x
    x = 306,246.72/717.32
  6. Step 6: Final answer
    x = 426.93

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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.