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Finding the Fourth Proportional to 31.60, 47.16 and 30.58

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Solution

The fourth proportional to 31.60, 47.16 and 30.58 is: 45.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.60 : 47.16 = 30.58 : x
  2. Step 2: Convert to fraction form
    31.60/47.16 = 30.58/x
  3. Step 3: Cross multiply
    31.60x = 47.16 × 30.58
  4. Step 4: Simplify right side
    31.60x = 1,442.15
  5. Step 5: Solve for x
    x = 1,442.15/31.60
  6. Step 6: Final answer
    x = 45.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.