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Finding the Fourth Proportional to 145.38, 200.55 and 90.15

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Solution

The fourth proportional to 145.38, 200.55 and 90.15 is: 124.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.38 : 200.55 = 90.15 : x
  2. Step 2: Convert to fraction form
    145.38/200.55 = 90.15/x
  3. Step 3: Cross multiply
    145.38x = 200.55 × 90.15
  4. Step 4: Simplify right side
    145.38x = 18,079.58
  5. Step 5: Solve for x
    x = 18,079.58/145.38
  6. Step 6: Final answer
    x = 124.36

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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.