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Finding the Fourth Proportional to 145.52, 201 and 128.06

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Solution

The fourth proportional to 145.52, 201 and 128.06 is: 176.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.52 : 201 = 128.06 : x
  2. Step 2: Convert to fraction form
    145.52/201 = 128.06/x
  3. Step 3: Cross multiply
    145.52x = 201 × 128.06
  4. Step 4: Simplify right side
    145.52x = 25,739.06
  5. Step 5: Solve for x
    x = 25,739.06/145.52
  6. Step 6: Final answer
    x = 176.88

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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.