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Finding the Fourth Proportional to 47.83, 66.02 and 30.58

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Solution

The fourth proportional to 47.83, 66.02 and 30.58 is: 42.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.83 : 66.02 = 30.58 : x
  2. Step 2: Convert to fraction form
    47.83/66.02 = 30.58/x
  3. Step 3: Cross multiply
    47.83x = 66.02 × 30.58
  4. Step 4: Simplify right side
    47.83x = 2,018.71
  5. Step 5: Solve for x
    x = 2,018.71/47.83
  6. Step 6: Final answer
    x = 42.21

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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.