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Finding the Fourth Proportional to 53.68, 73.78 and 51.28

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Solution

The fourth proportional to 53.68, 73.78 and 51.28 is: 70.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.68 : 73.78 = 51.28 : x
  2. Step 2: Convert to fraction form
    53.68/73.78 = 51.28/x
  3. Step 3: Cross multiply
    53.68x = 73.78 × 51.28
  4. Step 4: Simplify right side
    53.68x = 3,783.44
  5. Step 5: Solve for x
    x = 3,783.44/53.68
  6. Step 6: Final answer
    x = 70.48

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.