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Finding the Fourth Proportional to 390.88, 586.72 and 268.72

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Solution

The fourth proportional to 390.88, 586.72 and 268.72 is: 403.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.88 : 586.72 = 268.72 : x
  2. Step 2: Convert to fraction form
    390.88/586.72 = 268.72/x
  3. Step 3: Cross multiply
    390.88x = 586.72 × 268.72
  4. Step 4: Simplify right side
    390.88x = 157,663.40
  5. Step 5: Solve for x
    x = 157,663.40/390.88
  6. Step 6: Final answer
    x = 403.35

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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.