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Finding the Fourth Proportional to 399.48, 551.28 and 233.70

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Solution

The fourth proportional to 399.48, 551.28 and 233.70 is: 322.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.48 : 551.28 = 233.70 : x
  2. Step 2: Convert to fraction form
    399.48/551.28 = 233.70/x
  3. Step 3: Cross multiply
    399.48x = 551.28 × 233.70
  4. Step 4: Simplify right side
    399.48x = 128,834.14
  5. Step 5: Solve for x
    x = 128,834.14/399.48
  6. Step 6: Final answer
    x = 322.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.