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Finding the Fourth Proportional to 145.23, 216.19 and 143.07

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Solution

The fourth proportional to 145.23, 216.19 and 143.07 is: 212.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.23 : 216.19 = 143.07 : x
  2. Step 2: Convert to fraction form
    145.23/216.19 = 143.07/x
  3. Step 3: Cross multiply
    145.23x = 216.19 × 143.07
  4. Step 4: Simplify right side
    145.23x = 30,929.59
  5. Step 5: Solve for x
    x = 30,929.59/145.23
  6. Step 6: Final answer
    x = 212.97

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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.