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Finding the Fourth Proportional to 670.48, 925.14 and 390.73

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Solution

The fourth proportional to 670.48, 925.14 and 390.73 is: 539.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.48 : 925.14 = 390.73 : x
  2. Step 2: Convert to fraction form
    670.48/925.14 = 390.73/x
  3. Step 3: Cross multiply
    670.48x = 925.14 × 390.73
  4. Step 4: Simplify right side
    670.48x = 361,479.95
  5. Step 5: Solve for x
    x = 361,479.95/670.48
  6. Step 6: Final answer
    x = 539.14

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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.