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Finding the Fourth Proportional to 716.66, 989.01 and 421.95

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Solution

The fourth proportional to 716.66, 989.01 and 421.95 is: 582.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.66 : 989.01 = 421.95 : x
  2. Step 2: Convert to fraction form
    716.66/989.01 = 421.95/x
  3. Step 3: Cross multiply
    716.66x = 989.01 × 421.95
  4. Step 4: Simplify right side
    716.66x = 417,309.52
  5. Step 5: Solve for x
    x = 417,309.52/716.66
  6. Step 6: Final answer
    x = 582.30

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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.