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Finding the Fourth Proportional to 716.86, 988.94 and 421.99

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Solution

The fourth proportional to 716.86, 988.94 and 421.99 is: 582.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.86 : 988.94 = 421.99 : x
  2. Step 2: Convert to fraction form
    716.86/988.94 = 421.99/x
  3. Step 3: Cross multiply
    716.86x = 988.94 × 421.99
  4. Step 4: Simplify right side
    716.86x = 417,322.79
  5. Step 5: Solve for x
    x = 417,322.79/716.86
  6. Step 6: Final answer
    x = 582.15

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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.