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Finding the Fourth Proportional to 51.04, 70.42 and 28.91

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Solution

The fourth proportional to 51.04, 70.42 and 28.91 is: 39.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.04 : 70.42 = 28.91 : x
  2. Step 2: Convert to fraction form
    51.04/70.42 = 28.91/x
  3. Step 3: Cross multiply
    51.04x = 70.42 × 28.91
  4. Step 4: Simplify right side
    51.04x = 2,035.82
  5. Step 5: Solve for x
    x = 2,035.82/51.04
  6. Step 6: Final answer
    x = 39.89

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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.