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Finding the Fourth Proportional to 145.09, 200.30 and 98.45

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Solution

The fourth proportional to 145.09, 200.30 and 98.45 is: 135.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.09 : 200.30 = 98.45 : x
  2. Step 2: Convert to fraction form
    145.09/200.30 = 98.45/x
  3. Step 3: Cross multiply
    145.09x = 200.30 × 98.45
  4. Step 4: Simplify right side
    145.09x = 19,719.54
  5. Step 5: Solve for x
    x = 19,719.54/145.09
  6. Step 6: Final answer
    x = 135.91

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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.