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Finding the Fourth Proportional to 934.16, 1,399.96 and 386

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Solution

The fourth proportional to 934.16, 1,399.96 and 386 is: 578.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.16 : 1,399.96 = 386 : x
  2. Step 2: Convert to fraction form
    934.16/1,399.96 = 386/x
  3. Step 3: Cross multiply
    934.16x = 1,399.96 × 386
  4. Step 4: Simplify right side
    934.16x = 540,384.56
  5. Step 5: Solve for x
    x = 540,384.56/934.16
  6. Step 6: Final answer
    x = 578.47

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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.