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Finding the Fourth Proportional to 53.48, 73.74 and 47

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Solution

The fourth proportional to 53.48, 73.74 and 47 is: 64.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.48 : 73.74 = 47 : x
  2. Step 2: Convert to fraction form
    53.48/73.74 = 47/x
  3. Step 3: Cross multiply
    53.48x = 73.74 × 47
  4. Step 4: Simplify right side
    53.48x = 3,465.78
  5. Step 5: Solve for x
    x = 3,465.78/53.48
  6. Step 6: Final answer
    x = 64.81

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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.