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Finding the Fourth Proportional to 145.45, 200.78 and 87.27

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Solution

The fourth proportional to 145.45, 200.78 and 87.27 is: 120.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.45 : 200.78 = 87.27 : x
  2. Step 2: Convert to fraction form
    145.45/200.78 = 87.27/x
  3. Step 3: Cross multiply
    145.45x = 200.78 × 87.27
  4. Step 4: Simplify right side
    145.45x = 17,522.07
  5. Step 5: Solve for x
    x = 17,522.07/145.45
  6. Step 6: Final answer
    x = 120.47

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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.