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Finding the Fourth Proportional to 145.79, 201.13 and 99.30

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Solution

The fourth proportional to 145.79, 201.13 and 99.30 is: 136.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.79 : 201.13 = 99.30 : x
  2. Step 2: Convert to fraction form
    145.79/201.13 = 99.30/x
  3. Step 3: Cross multiply
    145.79x = 201.13 × 99.30
  4. Step 4: Simplify right side
    145.79x = 19,972.21
  5. Step 5: Solve for x
    x = 19,972.21/145.79
  6. Step 6: Final answer
    x = 136.99

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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.