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Finding the Fourth Proportional to 40.79, 56.16 and 40.64

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Solution

The fourth proportional to 40.79, 56.16 and 40.64 is: 55.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.79 : 56.16 = 40.64 : x
  2. Step 2: Convert to fraction form
    40.79/56.16 = 40.64/x
  3. Step 3: Cross multiply
    40.79x = 56.16 × 40.64
  4. Step 4: Simplify right side
    40.79x = 2,282.34
  5. Step 5: Solve for x
    x = 2,282.34/40.79
  6. Step 6: Final answer
    x = 55.95

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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.