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Finding the Fourth Proportional to 697.78, 1,046.95 and 287.12

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Solution

The fourth proportional to 697.78, 1,046.95 and 287.12 is: 430.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.78 : 1,046.95 = 287.12 : x
  2. Step 2: Convert to fraction form
    697.78/1,046.95 = 287.12/x
  3. Step 3: Cross multiply
    697.78x = 1,046.95 × 287.12
  4. Step 4: Simplify right side
    697.78x = 300,600.28
  5. Step 5: Solve for x
    x = 300,600.28/697.78
  6. Step 6: Final answer
    x = 430.80

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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.