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Finding the Fourth Proportional to 670.41, 925.17 and 390.68

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Solution

The fourth proportional to 670.41, 925.17 and 390.68 is: 539.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.41 : 925.17 = 390.68 : x
  2. Step 2: Convert to fraction form
    670.41/925.17 = 390.68/x
  3. Step 3: Cross multiply
    670.41x = 925.17 × 390.68
  4. Step 4: Simplify right side
    670.41x = 361,440.79
  5. Step 5: Solve for x
    x = 361,440.79/670.41
  6. Step 6: Final answer
    x = 539.13

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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.