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Finding the Fourth Proportional to 51.12, 70.53 and 30.40

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Solution

The fourth proportional to 51.12, 70.53 and 30.40 is: 41.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.12 : 70.53 = 30.40 : x
  2. Step 2: Convert to fraction form
    51.12/70.53 = 30.40/x
  3. Step 3: Cross multiply
    51.12x = 70.53 × 30.40
  4. Step 4: Simplify right side
    51.12x = 2,143.82
  5. Step 5: Solve for x
    x = 2,143.82/51.12
  6. Step 6: Final answer
    x = 41.94

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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.