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Finding the Fourth Proportional to 697.32, 1,045.72 and 210.21

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Solution

The fourth proportional to 697.32, 1,045.72 and 210.21 is: 315.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.32 : 1,045.72 = 210.21 : x
  2. Step 2: Convert to fraction form
    697.32/1,045.72 = 210.21/x
  3. Step 3: Cross multiply
    697.32x = 1,045.72 × 210.21
  4. Step 4: Simplify right side
    697.32x = 219,820.80
  5. Step 5: Solve for x
    x = 219,820.80/697.32
  6. Step 6: Final answer
    x = 315.24

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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.