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Finding the Fourth Proportional to 605.40, 909.18 and 421.26

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Solution

The fourth proportional to 605.40, 909.18 and 421.26 is: 632.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.40 : 909.18 = 421.26 : x
  2. Step 2: Convert to fraction form
    605.40/909.18 = 421.26/x
  3. Step 3: Cross multiply
    605.40x = 909.18 × 421.26
  4. Step 4: Simplify right side
    605.40x = 383,001.17
  5. Step 5: Solve for x
    x = 383,001.17/605.40
  6. Step 6: Final answer
    x = 632.64

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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.