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Finding the Fourth Proportional to 1,299.78, 1,793.68 and 710.31

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Solution

The fourth proportional to 1,299.78, 1,793.68 and 710.31 is: 980.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.78 : 1,793.68 = 710.31 : x
  2. Step 2: Convert to fraction form
    1,299.78/1,793.68 = 710.31/x
  3. Step 3: Cross multiply
    1,299.78x = 1,793.68 × 710.31
  4. Step 4: Simplify right side
    1,299.78x = 1,274,068.84
  5. Step 5: Solve for x
    x = 1,274,068.84/1,299.78
  6. Step 6: Final answer
    x = 980.22

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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.