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Finding the Fourth Proportional to 933.12, 1,399.28 and 347.90

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Solution

The fourth proportional to 933.12, 1,399.28 and 347.90 is: 521.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.12 : 1,399.28 = 347.90 : x
  2. Step 2: Convert to fraction form
    933.12/1,399.28 = 347.90/x
  3. Step 3: Cross multiply
    933.12x = 1,399.28 × 347.90
  4. Step 4: Simplify right side
    933.12x = 486,800.78
  5. Step 5: Solve for x
    x = 486,800.78/933.12
  6. Step 6: Final answer
    x = 521.69

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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.