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Finding the Fourth Proportional to 426.61, 640.10 and 221.32

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Solution

The fourth proportional to 426.61, 640.10 and 221.32 is: 332.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.61 : 640.10 = 221.32 : x
  2. Step 2: Convert to fraction form
    426.61/640.10 = 221.32/x
  3. Step 3: Cross multiply
    426.61x = 640.10 × 221.32
  4. Step 4: Simplify right side
    426.61x = 141,666.93
  5. Step 5: Solve for x
    x = 141,666.93/426.61
  6. Step 6: Final answer
    x = 332.08

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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.