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Finding the Fourth Proportional to 53.51, 79.80 and 47.12

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Solution

The fourth proportional to 53.51, 79.80 and 47.12 is: 70.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.51 : 79.80 = 47.12 : x
  2. Step 2: Convert to fraction form
    53.51/79.80 = 47.12/x
  3. Step 3: Cross multiply
    53.51x = 79.80 × 47.12
  4. Step 4: Simplify right side
    53.51x = 3,760.18
  5. Step 5: Solve for x
    x = 3,760.18/53.51
  6. Step 6: Final answer
    x = 70.27

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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.