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Finding the Fourth Proportional to 738.98, 1,108.99 and 478.34

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Solution

The fourth proportional to 738.98, 1,108.99 and 478.34 is: 717.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.98 : 1,108.99 = 478.34 : x
  2. Step 2: Convert to fraction form
    738.98/1,108.99 = 478.34/x
  3. Step 3: Cross multiply
    738.98x = 1,108.99 × 478.34
  4. Step 4: Simplify right side
    738.98x = 530,471.69
  5. Step 5: Solve for x
    x = 530,471.69/738.98
  6. Step 6: Final answer
    x = 717.84

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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.