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Finding the Fourth Proportional to 145.16, 216.21 and 143.26

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Solution

The fourth proportional to 145.16, 216.21 and 143.26 is: 213.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.16 : 216.21 = 143.26 : x
  2. Step 2: Convert to fraction form
    145.16/216.21 = 143.26/x
  3. Step 3: Cross multiply
    145.16x = 216.21 × 143.26
  4. Step 4: Simplify right side
    145.16x = 30,974.24
  5. Step 5: Solve for x
    x = 30,974.24/145.16
  6. Step 6: Final answer
    x = 213.38

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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.