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Finding the Fourth Proportional to 603.74, 907.70 and 421.89

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Solution

The fourth proportional to 603.74, 907.70 and 421.89 is: 634.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.74 : 907.70 = 421.89 : x
  2. Step 2: Convert to fraction form
    603.74/907.70 = 421.89/x
  3. Step 3: Cross multiply
    603.74x = 907.70 × 421.89
  4. Step 4: Simplify right side
    603.74x = 382,947.44
  5. Step 5: Solve for x
    x = 382,947.44/603.74
  6. Step 6: Final answer
    x = 634.30

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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.