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Finding the Fourth Proportional to 717.87, 1,075.62 and 690.90

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Solution

The fourth proportional to 717.87, 1,075.62 and 690.90 is: 1,035.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.87 : 1,075.62 = 690.90 : x
  2. Step 2: Convert to fraction form
    717.87/1,075.62 = 690.90/x
  3. Step 3: Cross multiply
    717.87x = 1,075.62 × 690.90
  4. Step 4: Simplify right side
    717.87x = 743,145.86
  5. Step 5: Solve for x
    x = 743,145.86/717.87
  6. Step 6: Final answer
    x = 1,035.21

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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.