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Finding the Fourth Proportional to 145.72, 201.02 and 86.70

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Solution

The fourth proportional to 145.72, 201.02 and 86.70 is: 119.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.72 : 201.02 = 86.70 : x
  2. Step 2: Convert to fraction form
    145.72/201.02 = 86.70/x
  3. Step 3: Cross multiply
    145.72x = 201.02 × 86.70
  4. Step 4: Simplify right side
    145.72x = 17,428.43
  5. Step 5: Solve for x
    x = 17,428.43/145.72
  6. Step 6: Final answer
    x = 119.60

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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.