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Finding the Fourth Proportional to 53.55, 79.89 and 48.72

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Solution

The fourth proportional to 53.55, 79.89 and 48.72 is: 72.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.55 : 79.89 = 48.72 : x
  2. Step 2: Convert to fraction form
    53.55/79.89 = 48.72/x
  3. Step 3: Cross multiply
    53.55x = 79.89 × 48.72
  4. Step 4: Simplify right side
    53.55x = 3,892.24
  5. Step 5: Solve for x
    x = 3,892.24/53.55
  6. Step 6: Final answer
    x = 72.68

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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.