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Finding the Fourth Proportional to 1,299.90, 1,793.82 and 710.40

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Solution

The fourth proportional to 1,299.90, 1,793.82 and 710.40 is: 980.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.90 : 1,793.82 = 710.40 : x
  2. Step 2: Convert to fraction form
    1,299.90/1,793.82 = 710.40/x
  3. Step 3: Cross multiply
    1,299.90x = 1,793.82 × 710.40
  4. Step 4: Simplify right side
    1,299.90x = 1,274,329.73
  5. Step 5: Solve for x
    x = 1,274,329.73/1,299.90
  6. Step 6: Final answer
    x = 980.33

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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.