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Finding the Fourth Proportional to 47.79, 66.20 and 45.90

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Solution

The fourth proportional to 47.79, 66.20 and 45.90 is: 63.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.79 : 66.20 = 45.90 : x
  2. Step 2: Convert to fraction form
    47.79/66.20 = 45.90/x
  3. Step 3: Cross multiply
    47.79x = 66.20 × 45.90
  4. Step 4: Simplify right side
    47.79x = 3,038.35
  5. Step 5: Solve for x
    x = 3,038.35/47.79
  6. Step 6: Final answer
    x = 63.58

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.