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Finding the Fourth Proportional to 53.92, 74.32 and 39.36

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Solution

The fourth proportional to 53.92, 74.32 and 39.36 is: 54.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.92 : 74.32 = 39.36 : x
  2. Step 2: Convert to fraction form
    53.92/74.32 = 39.36/x
  3. Step 3: Cross multiply
    53.92x = 74.32 × 39.36
  4. Step 4: Simplify right side
    53.92x = 2,925.24
  5. Step 5: Solve for x
    x = 2,925.24/53.92
  6. Step 6: Final answer
    x = 54.25

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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.