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Finding the Fourth Proportional to 738.98, 1,108.90 and 328.10

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Solution

The fourth proportional to 738.98, 1,108.90 and 328.10 is: 492.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.98 : 1,108.90 = 328.10 : x
  2. Step 2: Convert to fraction form
    738.98/1,108.90 = 328.10/x
  3. Step 3: Cross multiply
    738.98x = 1,108.90 × 328.10
  4. Step 4: Simplify right side
    738.98x = 363,830.09
  5. Step 5: Solve for x
    x = 363,830.09/738.98
  6. Step 6: Final answer
    x = 492.34

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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.