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Finding the Fourth Proportional to 923.40, 1,385.28 and 338.52

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Solution

The fourth proportional to 923.40, 1,385.28 and 338.52 is: 507.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.40 : 1,385.28 = 338.52 : x
  2. Step 2: Convert to fraction form
    923.40/1,385.28 = 338.52/x
  3. Step 3: Cross multiply
    923.40x = 1,385.28 × 338.52
  4. Step 4: Simplify right side
    923.40x = 468,944.99
  5. Step 5: Solve for x
    x = 468,944.99/923.40
  6. Step 6: Final answer
    x = 507.85

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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.