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Finding the Fourth Proportional to 939.75, 1,410.79 and 609.61

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Solution

The fourth proportional to 939.75, 1,410.79 and 609.61 is: 915.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.75 : 1,410.79 = 609.61 : x
  2. Step 2: Convert to fraction form
    939.75/1,410.79 = 609.61/x
  3. Step 3: Cross multiply
    939.75x = 1,410.79 × 609.61
  4. Step 4: Simplify right side
    939.75x = 860,031.69
  5. Step 5: Solve for x
    x = 860,031.69/939.75
  6. Step 6: Final answer
    x = 915.17

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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.