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Finding the Fourth Proportional to 288.21, 432.02 and 143.63

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Solution

The fourth proportional to 288.21, 432.02 and 143.63 is: 215.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.21 : 432.02 = 143.63 : x
  2. Step 2: Convert to fraction form
    288.21/432.02 = 143.63/x
  3. Step 3: Cross multiply
    288.21x = 432.02 × 143.63
  4. Step 4: Simplify right side
    288.21x = 62,048.15
  5. Step 5: Solve for x
    x = 62,048.15/288.21
  6. Step 6: Final answer
    x = 215.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.