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Finding the Fourth Proportional to 691.11, 1,035.86 and 280.04

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Solution

The fourth proportional to 691.11, 1,035.86 and 280.04 is: 419.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.11 : 1,035.86 = 280.04 : x
  2. Step 2: Convert to fraction form
    691.11/1,035.86 = 280.04/x
  3. Step 3: Cross multiply
    691.11x = 1,035.86 × 280.04
  4. Step 4: Simplify right side
    691.11x = 290,075.65
  5. Step 5: Solve for x
    x = 290,075.65/691.11
  6. Step 6: Final answer
    x = 419.72

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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.