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Finding the Fourth Proportional to 53.13, 79.20 and 51.69

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Solution

The fourth proportional to 53.13, 79.20 and 51.69 is: 77.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.13 : 79.20 = 51.69 : x
  2. Step 2: Convert to fraction form
    53.13/79.20 = 51.69/x
  3. Step 3: Cross multiply
    53.13x = 79.20 × 51.69
  4. Step 4: Simplify right side
    53.13x = 4,093.85
  5. Step 5: Solve for x
    x = 4,093.85/53.13
  6. Step 6: Final answer
    x = 77.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.