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Finding the Fourth Proportional to 400.76, 553.30 and 307.32

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Solution

The fourth proportional to 400.76, 553.30 and 307.32 is: 424.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.76 : 553.30 = 307.32 : x
  2. Step 2: Convert to fraction form
    400.76/553.30 = 307.32/x
  3. Step 3: Cross multiply
    400.76x = 553.30 × 307.32
  4. Step 4: Simplify right side
    400.76x = 170,040.55
  5. Step 5: Solve for x
    x = 170,040.55/400.76
  6. Step 6: Final answer
    x = 424.30

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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.