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Finding the Fourth Proportional to 53.57, 79.92 and 47.09

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Solution

The fourth proportional to 53.57, 79.92 and 47.09 is: 70.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.57 : 79.92 = 47.09 : x
  2. Step 2: Convert to fraction form
    53.57/79.92 = 47.09/x
  3. Step 3: Cross multiply
    53.57x = 79.92 × 47.09
  4. Step 4: Simplify right side
    53.57x = 3,763.43
  5. Step 5: Solve for x
    x = 3,763.43/53.57
  6. Step 6: Final answer
    x = 70.25

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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.