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Finding the Fourth Proportional to 288.80, 432.30 and 207.80

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Solution

The fourth proportional to 288.80, 432.30 and 207.80 is: 311.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.80 : 432.30 = 207.80 : x
  2. Step 2: Convert to fraction form
    288.80/432.30 = 207.80/x
  3. Step 3: Cross multiply
    288.80x = 432.30 × 207.80
  4. Step 4: Simplify right side
    288.80x = 89,831.94
  5. Step 5: Solve for x
    x = 89,831.94/288.80
  6. Step 6: Final answer
    x = 311.05

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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.