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Finding the Fourth Proportional to 716.72, 989.01 and 422.01

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Solution

The fourth proportional to 716.72, 989.01 and 422.01 is: 582.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.72 : 989.01 = 422.01 : x
  2. Step 2: Convert to fraction form
    716.72/989.01 = 422.01/x
  3. Step 3: Cross multiply
    716.72x = 989.01 × 422.01
  4. Step 4: Simplify right side
    716.72x = 417,372.11
  5. Step 5: Solve for x
    x = 417,372.11/716.72
  6. Step 6: Final answer
    x = 582.34

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1.5x scale

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.