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Finding the Fourth Proportional to 145.09, 216.60 and 140.03

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Solution

The fourth proportional to 145.09, 216.60 and 140.03 is: 209.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.09 : 216.60 = 140.03 : x
  2. Step 2: Convert to fraction form
    145.09/216.60 = 140.03/x
  3. Step 3: Cross multiply
    145.09x = 216.60 × 140.03
  4. Step 4: Simplify right side
    145.09x = 30,330.23
  5. Step 5: Solve for x
    x = 30,330.23/145.09
  6. Step 6: Final answer
    x = 209.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.