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Finding the Fourth Proportional to 32.10, 44.16 and 31.20

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Solution

The fourth proportional to 32.10, 44.16 and 31.20 is: 42.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.10 : 44.16 = 31.20 : x
  2. Step 2: Convert to fraction form
    32.10/44.16 = 31.20/x
  3. Step 3: Cross multiply
    32.10x = 44.16 × 31.20
  4. Step 4: Simplify right side
    32.10x = 1,377.79
  5. Step 5: Solve for x
    x = 1,377.79/32.10
  6. Step 6: Final answer
    x = 42.92

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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.