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Finding the Fourth Proportional to 1,162.62, 1,604 and 690.65

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Solution

The fourth proportional to 1,162.62, 1,604 and 690.65 is: 952.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.62 : 1,604 = 690.65 : x
  2. Step 2: Convert to fraction form
    1,162.62/1,604 = 690.65/x
  3. Step 3: Cross multiply
    1,162.62x = 1,604 × 690.65
  4. Step 4: Simplify right side
    1,162.62x = 1,107,802.60
  5. Step 5: Solve for x
    x = 1,107,802.60/1,162.62
  6. Step 6: Final answer
    x = 952.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.