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Finding the Fourth Proportional to 393.18, 587.14 and 370.40

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Solution

The fourth proportional to 393.18, 587.14 and 370.40 is: 553.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.18 : 587.14 = 370.40 : x
  2. Step 2: Convert to fraction form
    393.18/587.14 = 370.40/x
  3. Step 3: Cross multiply
    393.18x = 587.14 × 370.40
  4. Step 4: Simplify right side
    393.18x = 217,476.66
  5. Step 5: Solve for x
    x = 217,476.66/393.18
  6. Step 6: Final answer
    x = 553.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.