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Finding the Fourth Proportional to 710.40, 1,065.96 and 320.88

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Solution

The fourth proportional to 710.40, 1,065.96 and 320.88 is: 481.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.40 : 1,065.96 = 320.88 : x
  2. Step 2: Convert to fraction form
    710.40/1,065.96 = 320.88/x
  3. Step 3: Cross multiply
    710.40x = 1,065.96 × 320.88
  4. Step 4: Simplify right side
    710.40x = 342,045.24
  5. Step 5: Solve for x
    x = 342,045.24/710.40
  6. Step 6: Final answer
    x = 481.48

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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.