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Finding the Fourth Proportional to 1,299.50, 1,793.31 and 710

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Solution

The fourth proportional to 1,299.50, 1,793.31 and 710 is: 979.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.50 : 1,793.31 = 710 : x
  2. Step 2: Convert to fraction form
    1,299.50/1,793.31 = 710/x
  3. Step 3: Cross multiply
    1,299.50x = 1,793.31 × 710
  4. Step 4: Simplify right side
    1,299.50x = 1,273,250.10
  5. Step 5: Solve for x
    x = 1,273,250.10/1,299.50
  6. Step 6: Final answer
    x = 979.80

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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.