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Finding the Fourth Proportional to 697.36, 1,045.76 and 210.40

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Solution

The fourth proportional to 697.36, 1,045.76 and 210.40 is: 315.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.36 : 1,045.76 = 210.40 : x
  2. Step 2: Convert to fraction form
    697.36/1,045.76 = 210.40/x
  3. Step 3: Cross multiply
    697.36x = 1,045.76 × 210.40
  4. Step 4: Simplify right side
    697.36x = 220,027.90
  5. Step 5: Solve for x
    x = 220,027.90/697.36
  6. Step 6: Final answer
    x = 315.52

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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.