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Finding the Fourth Proportional to 670.91, 925.95 and 391.30

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Solution

The fourth proportional to 670.91, 925.95 and 391.30 is: 540.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.91 : 925.95 = 391.30 : x
  2. Step 2: Convert to fraction form
    670.91/925.95 = 391.30/x
  3. Step 3: Cross multiply
    670.91x = 925.95 × 391.30
  4. Step 4: Simplify right side
    670.91x = 362,323.39
  5. Step 5: Solve for x
    x = 362,323.39/670.91
  6. Step 6: Final answer
    x = 540.05

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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.