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Finding the Fourth Proportional to 390, 536.97 and 348.42

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Solution

The fourth proportional to 390, 536.97 and 348.42 is: 479.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    390 : 536.97 = 348.42 : x
  2. Step 2: Convert to fraction form
    390/536.97 = 348.42/x
  3. Step 3: Cross multiply
    390x = 536.97 × 348.42
  4. Step 4: Simplify right side
    390x = 187,091.09
  5. Step 5: Solve for x
    x = 187,091.09/390
  6. Step 6: Final answer
    x = 479.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.