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Finding the Fourth Proportional to 697.28, 1,045.67 and 210.15

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Solution

The fourth proportional to 697.28, 1,045.67 and 210.15 is: 315.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.28 : 1,045.67 = 210.15 : x
  2. Step 2: Convert to fraction form
    697.28/1,045.67 = 210.15/x
  3. Step 3: Cross multiply
    697.28x = 1,045.67 × 210.15
  4. Step 4: Simplify right side
    697.28x = 219,746.50
  5. Step 5: Solve for x
    x = 219,746.50/697.28
  6. Step 6: Final answer
    x = 315.15

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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.