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Finding the Fourth Proportional to 420.15, 630.24 and 339.15

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Solution

The fourth proportional to 420.15, 630.24 and 339.15 is: 508.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.15 : 630.24 = 339.15 : x
  2. Step 2: Convert to fraction form
    420.15/630.24 = 339.15/x
  3. Step 3: Cross multiply
    420.15x = 630.24 × 339.15
  4. Step 4: Simplify right side
    420.15x = 213,745.90
  5. Step 5: Solve for x
    x = 213,745.90/420.15
  6. Step 6: Final answer
    x = 508.74

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Why These Related Problems?

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