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Finding the Fourth Proportional to 420.68, 576.89 and 400.52

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Solution

The fourth proportional to 420.68, 576.89 and 400.52 is: 549.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.68 : 576.89 = 400.52 : x
  2. Step 2: Convert to fraction form
    420.68/576.89 = 400.52/x
  3. Step 3: Cross multiply
    420.68x = 576.89 × 400.52
  4. Step 4: Simplify right side
    420.68x = 231,055.98
  5. Step 5: Solve for x
    x = 231,055.98/420.68
  6. Step 6: Final answer
    x = 549.24

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.