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Finding the Fourth Proportional to 57.79, 79.65 and 47.35

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Solution

The fourth proportional to 57.79, 79.65 and 47.35 is: 65.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.79 : 79.65 = 47.35 : x
  2. Step 2: Convert to fraction form
    57.79/79.65 = 47.35/x
  3. Step 3: Cross multiply
    57.79x = 79.65 × 47.35
  4. Step 4: Simplify right side
    57.79x = 3,771.43
  5. Step 5: Solve for x
    x = 3,771.43/57.79
  6. Step 6: Final answer
    x = 65.26

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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.