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Finding the Fourth Proportional to 661.66, 912.98 and 422.48

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Solution

The fourth proportional to 661.66, 912.98 and 422.48 is: 582.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.66 : 912.98 = 422.48 : x
  2. Step 2: Convert to fraction form
    661.66/912.98 = 422.48/x
  3. Step 3: Cross multiply
    661.66x = 912.98 × 422.48
  4. Step 4: Simplify right side
    661.66x = 385,715.79
  5. Step 5: Solve for x
    x = 385,715.79/661.66
  6. Step 6: Final answer
    x = 582.95

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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.