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Finding the Fourth Proportional to 53.60, 79.90 and 47.75

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Solution

The fourth proportional to 53.60, 79.90 and 47.75 is: 71.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.60 : 79.90 = 47.75 : x
  2. Step 2: Convert to fraction form
    53.60/79.90 = 47.75/x
  3. Step 3: Cross multiply
    53.60x = 79.90 × 47.75
  4. Step 4: Simplify right side
    53.60x = 3,814.71
  5. Step 5: Solve for x
    x = 3,814.71/53.60
  6. Step 6: Final answer
    x = 71.18

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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.