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Finding the Fourth Proportional to 288.62, 432.91 and 72.20

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Solution

The fourth proportional to 288.62, 432.91 and 72.20 is: 108.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.62 : 432.91 = 72.20 : x
  2. Step 2: Convert to fraction form
    288.62/432.91 = 72.20/x
  3. Step 3: Cross multiply
    288.62x = 432.91 × 72.20
  4. Step 4: Simplify right side
    288.62x = 31,256.10
  5. Step 5: Solve for x
    x = 31,256.10/288.62
  6. Step 6: Final answer
    x = 108.29

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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.