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Finding the Fourth Proportional to 933.12, 1,399.98 and 386.36

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Solution

The fourth proportional to 933.12, 1,399.98 and 386.36 is: 579.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.12 : 1,399.98 = 386.36 : x
  2. Step 2: Convert to fraction form
    933.12/1,399.98 = 386.36/x
  3. Step 3: Cross multiply
    933.12x = 1,399.98 × 386.36
  4. Step 4: Simplify right side
    933.12x = 540,896.27
  5. Step 5: Solve for x
    x = 540,896.27/933.12
  6. Step 6: Final answer
    x = 579.66

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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.