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Finding the Fourth Proportional to 145.78, 201.20 and 90.56

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Solution

The fourth proportional to 145.78, 201.20 and 90.56 is: 124.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.78 : 201.20 = 90.56 : x
  2. Step 2: Convert to fraction form
    145.78/201.20 = 90.56/x
  3. Step 3: Cross multiply
    145.78x = 201.20 × 90.56
  4. Step 4: Simplify right side
    145.78x = 18,220.67
  5. Step 5: Solve for x
    x = 18,220.67/145.78
  6. Step 6: Final answer
    x = 124.99

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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.