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Finding the Fourth Proportional to 53.51, 79.79 and 49.86

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Solution

The fourth proportional to 53.51, 79.79 and 49.86 is: 74.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.51 : 79.79 = 49.86 : x
  2. Step 2: Convert to fraction form
    53.51/79.79 = 49.86/x
  3. Step 3: Cross multiply
    53.51x = 79.79 × 49.86
  4. Step 4: Simplify right side
    53.51x = 3,978.08
  5. Step 5: Solve for x
    x = 3,978.08/53.51
  6. Step 6: Final answer
    x = 74.35

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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.