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Finding the Fourth Proportional to 710.40, 1,065.86 and 320.28

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Solution

The fourth proportional to 710.40, 1,065.86 and 320.28 is: 480.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.40 : 1,065.86 = 320.28 : x
  2. Step 2: Convert to fraction form
    710.40/1,065.86 = 320.28/x
  3. Step 3: Cross multiply
    710.40x = 1,065.86 × 320.28
  4. Step 4: Simplify right side
    710.40x = 341,379.04
  5. Step 5: Solve for x
    x = 341,379.04/710.40
  6. Step 6: Final answer
    x = 480.54

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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.