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Finding the Fourth Proportional to 933.80, 1,400.40 and 386

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Solution

The fourth proportional to 933.80, 1,400.40 and 386 is: 578.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.80 : 1,400.40 = 386 : x
  2. Step 2: Convert to fraction form
    933.80/1,400.40 = 386/x
  3. Step 3: Cross multiply
    933.80x = 1,400.40 × 386
  4. Step 4: Simplify right side
    933.80x = 540,554.40
  5. Step 5: Solve for x
    x = 540,554.40/933.80
  6. Step 6: Final answer
    x = 578.88

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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.