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Finding the Fourth Proportional to 847.30, 1,270.98 and 685.30

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Solution

The fourth proportional to 847.30, 1,270.98 and 685.30 is: 1,027.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.30 : 1,270.98 = 685.30 : x
  2. Step 2: Convert to fraction form
    847.30/1,270.98 = 685.30/x
  3. Step 3: Cross multiply
    847.30x = 1,270.98 × 685.30
  4. Step 4: Simplify right side
    847.30x = 871,002.59
  5. Step 5: Solve for x
    x = 871,002.59/847.30
  6. Step 6: Final answer
    x = 1,027.97

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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.