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Finding the Fourth Proportional to 145.47, 218.28 and 54.17

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Solution

The fourth proportional to 145.47, 218.28 and 54.17 is: 81.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.47 : 218.28 = 54.17 : x
  2. Step 2: Convert to fraction form
    145.47/218.28 = 54.17/x
  3. Step 3: Cross multiply
    145.47x = 218.28 × 54.17
  4. Step 4: Simplify right side
    145.47x = 11,823.14
  5. Step 5: Solve for x
    x = 11,823.14/145.47
  6. Step 6: Final answer
    x = 81.28

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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.