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Finding the Fourth Proportional to 710.89, 1,066.74 and 320.91

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Solution

The fourth proportional to 710.89, 1,066.74 and 320.91 is: 481.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.89 : 1,066.74 = 320.91 : x
  2. Step 2: Convert to fraction form
    710.89/1,066.74 = 320.91/x
  3. Step 3: Cross multiply
    710.89x = 1,066.74 × 320.91
  4. Step 4: Simplify right side
    710.89x = 342,322.33
  5. Step 5: Solve for x
    x = 342,322.33/710.89
  6. Step 6: Final answer
    x = 481.54

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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.