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Finding the Fourth Proportional to 432.80, 648.64 and 240

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Solution

The fourth proportional to 432.80, 648.64 and 240 is: 359.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.80 : 648.64 = 240 : x
  2. Step 2: Convert to fraction form
    432.80/648.64 = 240/x
  3. Step 3: Cross multiply
    432.80x = 648.64 × 240
  4. Step 4: Simplify right side
    432.80x = 155,673.60
  5. Step 5: Solve for x
    x = 155,673.60/432.80
  6. Step 6: Final answer
    x = 359.69

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