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Finding the Fourth Proportional to 145.29, 216.49 and 143.90

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Solution

The fourth proportional to 145.29, 216.49 and 143.90 is: 214.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.29 : 216.49 = 143.90 : x
  2. Step 2: Convert to fraction form
    145.29/216.49 = 143.90/x
  3. Step 3: Cross multiply
    145.29x = 216.49 × 143.90
  4. Step 4: Simplify right side
    145.29x = 31,151.47
  5. Step 5: Solve for x
    x = 31,151.47/145.29
  6. Step 6: Final answer
    x = 214.41

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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.