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Finding the Fourth Proportional to 1,247.26, 1,870.70 and 662

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Solution

The fourth proportional to 1,247.26, 1,870.70 and 662 is: 992.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.26 : 1,870.70 = 662 : x
  2. Step 2: Convert to fraction form
    1,247.26/1,870.70 = 662/x
  3. Step 3: Cross multiply
    1,247.26x = 1,870.70 × 662
  4. Step 4: Simplify right side
    1,247.26x = 1,238,403.40
  5. Step 5: Solve for x
    x = 1,238,403.40/1,247.26
  6. Step 6: Final answer
    x = 992.90

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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.