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Finding the Fourth Proportional to 697.55, 1,046.13 and 210.65

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Solution

The fourth proportional to 697.55, 1,046.13 and 210.65 is: 315.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.55 : 1,046.13 = 210.65 : x
  2. Step 2: Convert to fraction form
    697.55/1,046.13 = 210.65/x
  3. Step 3: Cross multiply
    697.55x = 1,046.13 × 210.65
  4. Step 4: Simplify right side
    697.55x = 220,362.05
  5. Step 5: Solve for x
    x = 220,362.05/697.55
  6. Step 6: Final answer
    x = 315.91

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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.