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Finding the Fourth Proportional to 38.47, 52.90 and 31.00

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Solution

The fourth proportional to 38.47, 52.90 and 31.00 is: 42.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.47 : 52.90 = 31.00 : x
  2. Step 2: Convert to fraction form
    38.47/52.90 = 31.00/x
  3. Step 3: Cross multiply
    38.47x = 52.90 × 31.00
  4. Step 4: Simplify right side
    38.47x = 1,639.69
  5. Step 5: Solve for x
    x = 1,639.69/38.47
  6. Step 6: Final answer
    x = 42.63

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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.