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Finding the Fourth Proportional to 145.91, 219.38 and 100.47

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Solution

The fourth proportional to 145.91, 219.38 and 100.47 is: 151.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.91 : 219.38 = 100.47 : x
  2. Step 2: Convert to fraction form
    145.91/219.38 = 100.47/x
  3. Step 3: Cross multiply
    145.91x = 219.38 × 100.47
  4. Step 4: Simplify right side
    145.91x = 22,040.43
  5. Step 5: Solve for x
    x = 22,040.43/145.91
  6. Step 6: Final answer
    x = 151.05

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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.