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Finding the Fourth Proportional to 288.48, 432.78 and 144.18

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Solution

The fourth proportional to 288.48, 432.78 and 144.18 is: 216.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.48 : 432.78 = 144.18 : x
  2. Step 2: Convert to fraction form
    288.48/432.78 = 144.18/x
  3. Step 3: Cross multiply
    288.48x = 432.78 × 144.18
  4. Step 4: Simplify right side
    288.48x = 62,398.22
  5. Step 5: Solve for x
    x = 62,398.22/288.48
  6. Step 6: Final answer
    x = 216.30

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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.