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Finding the Fourth Proportional to 51.30, 70.80 and 49.47

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Solution

The fourth proportional to 51.30, 70.80 and 49.47 is: 68.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.30 : 70.80 = 49.47 : x
  2. Step 2: Convert to fraction form
    51.30/70.80 = 49.47/x
  3. Step 3: Cross multiply
    51.30x = 70.80 × 49.47
  4. Step 4: Simplify right side
    51.30x = 3,502.48
  5. Step 5: Solve for x
    x = 3,502.48/51.30
  6. Step 6: Final answer
    x = 68.27

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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.