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Finding the Fourth Proportional to 47.07, 64.95 and 28.65

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Solution

The fourth proportional to 47.07, 64.95 and 28.65 is: 39.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.07 : 64.95 = 28.65 : x
  2. Step 2: Convert to fraction form
    47.07/64.95 = 28.65/x
  3. Step 3: Cross multiply
    47.07x = 64.95 × 28.65
  4. Step 4: Simplify right side
    47.07x = 1,860.82
  5. Step 5: Solve for x
    x = 1,860.82/47.07
  6. Step 6: Final answer
    x = 39.53

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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.