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Finding the Fourth Proportional to 47.90, 65.65 and 47.36

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Solution

The fourth proportional to 47.90, 65.65 and 47.36 is: 64.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.90 : 65.65 = 47.36 : x
  2. Step 2: Convert to fraction form
    47.90/65.65 = 47.36/x
  3. Step 3: Cross multiply
    47.90x = 65.65 × 47.36
  4. Step 4: Simplify right side
    47.90x = 3,109.18
  5. Step 5: Solve for x
    x = 3,109.18/47.90
  6. Step 6: Final answer
    x = 64.91

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.