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Finding the Fourth Proportional to 1,239.80, 1,710.24 and 847.40

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Solution

The fourth proportional to 1,239.80, 1,710.24 and 847.40 is: 1,168.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.80 : 1,710.24 = 847.40 : x
  2. Step 2: Convert to fraction form
    1,239.80/1,710.24 = 847.40/x
  3. Step 3: Cross multiply
    1,239.80x = 1,710.24 × 847.40
  4. Step 4: Simplify right side
    1,239.80x = 1,449,257.38
  5. Step 5: Solve for x
    x = 1,449,257.38/1,239.80
  6. Step 6: Final answer
    x = 1,168.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.