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Finding the Fourth Proportional to 420.66, 630.90 and 276.48

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Solution

The fourth proportional to 420.66, 630.90 and 276.48 is: 414.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.66 : 630.90 = 276.48 : x
  2. Step 2: Convert to fraction form
    420.66/630.90 = 276.48/x
  3. Step 3: Cross multiply
    420.66x = 630.90 × 276.48
  4. Step 4: Simplify right side
    420.66x = 174,431.23
  5. Step 5: Solve for x
    x = 174,431.23/420.66
  6. Step 6: Final answer
    x = 414.66

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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.