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Finding the Fourth Proportional to 710.91, 1,065.65 and 320.63

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Solution

The fourth proportional to 710.91, 1,065.65 and 320.63 is: 480.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.91 : 1,065.65 = 320.63 : x
  2. Step 2: Convert to fraction form
    710.91/1,065.65 = 320.63/x
  3. Step 3: Cross multiply
    710.91x = 1,065.65 × 320.63
  4. Step 4: Simplify right side
    710.91x = 341,672.43
  5. Step 5: Solve for x
    x = 341,672.43/710.91
  6. Step 6: Final answer
    x = 480.61

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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.