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Finding the Fourth Proportional to 145.79, 201.51 and 128.17

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Solution

The fourth proportional to 145.79, 201.51 and 128.17 is: 177.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.79 : 201.51 = 128.17 : x
  2. Step 2: Convert to fraction form
    145.79/201.51 = 128.17/x
  3. Step 3: Cross multiply
    145.79x = 201.51 × 128.17
  4. Step 4: Simplify right side
    145.79x = 25,828.36
  5. Step 5: Solve for x
    x = 25,828.36/145.79
  6. Step 6: Final answer
    x = 177.16

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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.