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Finding the Fourth Proportional to 145.70, 201.09 and 87.51

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Solution

The fourth proportional to 145.70, 201.09 and 87.51 is: 120.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.70 : 201.09 = 87.51 : x
  2. Step 2: Convert to fraction form
    145.70/201.09 = 87.51/x
  3. Step 3: Cross multiply
    145.70x = 201.09 × 87.51
  4. Step 4: Simplify right side
    145.70x = 17,597.39
  5. Step 5: Solve for x
    x = 17,597.39/145.70
  6. Step 6: Final answer
    x = 120.78

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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.