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Finding the Fourth Proportional to 145.87, 201.39 and 90.65

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Solution

The fourth proportional to 145.87, 201.39 and 90.65 is: 125.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.87 : 201.39 = 90.65 : x
  2. Step 2: Convert to fraction form
    145.87/201.39 = 90.65/x
  3. Step 3: Cross multiply
    145.87x = 201.39 × 90.65
  4. Step 4: Simplify right side
    145.87x = 18,256.17
  5. Step 5: Solve for x
    x = 18,256.17/145.87
  6. Step 6: Final answer
    x = 125.16

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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.