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Finding the Fourth Proportional to 54.40, 75.07 and 31.08

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Solution

The fourth proportional to 54.40, 75.07 and 31.08 is: 42.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.40 : 75.07 = 31.08 : x
  2. Step 2: Convert to fraction form
    54.40/75.07 = 31.08/x
  3. Step 3: Cross multiply
    54.40x = 75.07 × 31.08
  4. Step 4: Simplify right side
    54.40x = 2,333.04
  5. Step 5: Solve for x
    x = 2,333.04/54.40
  6. Step 6: Final answer
    x = 42.89

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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.