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Finding the Fourth Proportional to 75.15, 103.72 and 47.55

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Solution

The fourth proportional to 75.15, 103.72 and 47.55 is: 65.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.15 : 103.72 = 47.55 : x
  2. Step 2: Convert to fraction form
    75.15/103.72 = 47.55/x
  3. Step 3: Cross multiply
    75.15x = 103.72 × 47.55
  4. Step 4: Simplify right side
    75.15x = 4,931.65
  5. Step 5: Solve for x
    x = 4,931.65/75.15
  6. Step 6: Final answer
    x = 65.62

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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.