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Finding the Fourth Proportional to 390.96, 583.07 and 372.74

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Solution

The fourth proportional to 390.96, 583.07 and 372.74 is: 555.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.96 : 583.07 = 372.74 : x
  2. Step 2: Convert to fraction form
    390.96/583.07 = 372.74/x
  3. Step 3: Cross multiply
    390.96x = 583.07 × 372.74
  4. Step 4: Simplify right side
    390.96x = 217,328.73
  5. Step 5: Solve for x
    x = 217,328.73/390.96
  6. Step 6: Final answer
    x = 555.88

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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.