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Finding the Fourth Proportional to 400.62, 552.54 and 307.20

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Solution

The fourth proportional to 400.62, 552.54 and 307.20 is: 423.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.62 : 552.54 = 307.20 : x
  2. Step 2: Convert to fraction form
    400.62/552.54 = 307.20/x
  3. Step 3: Cross multiply
    400.62x = 552.54 × 307.20
  4. Step 4: Simplify right side
    400.62x = 169,740.29
  5. Step 5: Solve for x
    x = 169,740.29/400.62
  6. Step 6: Final answer
    x = 423.69

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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.