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Finding the Fourth Proportional to 145.91, 218.72 and 54.58

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Solution

The fourth proportional to 145.91, 218.72 and 54.58 is: 81.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.91 : 218.72 = 54.58 : x
  2. Step 2: Convert to fraction form
    145.91/218.72 = 54.58/x
  3. Step 3: Cross multiply
    145.91x = 218.72 × 54.58
  4. Step 4: Simplify right side
    145.91x = 11,937.74
  5. Step 5: Solve for x
    x = 11,937.74/145.91
  6. Step 6: Final answer
    x = 81.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.