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Finding the Fourth Proportional to 51.12, 70.38 and 40.17

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Solution

The fourth proportional to 51.12, 70.38 and 40.17 is: 55.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.12 : 70.38 = 40.17 : x
  2. Step 2: Convert to fraction form
    51.12/70.38 = 40.17/x
  3. Step 3: Cross multiply
    51.12x = 70.38 × 40.17
  4. Step 4: Simplify right side
    51.12x = 2,827.16
  5. Step 5: Solve for x
    x = 2,827.16/51.12
  6. Step 6: Final answer
    x = 55.30

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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.