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Finding the Fourth Proportional to 426.48, 639.77 and 210.12

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Solution

The fourth proportional to 426.48, 639.77 and 210.12 is: 315.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.48 : 639.77 = 210.12 : x
  2. Step 2: Convert to fraction form
    426.48/639.77 = 210.12/x
  3. Step 3: Cross multiply
    426.48x = 639.77 × 210.12
  4. Step 4: Simplify right side
    426.48x = 134,427.42
  5. Step 5: Solve for x
    x = 134,427.42/426.48
  6. Step 6: Final answer
    x = 315.20

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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.