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Finding the Fourth Proportional to 670.72, 925.76 and 391.16

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Solution

The fourth proportional to 670.72, 925.76 and 391.16 is: 539.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.72 : 925.76 = 391.16 : x
  2. Step 2: Convert to fraction form
    670.72/925.76 = 391.16/x
  3. Step 3: Cross multiply
    670.72x = 925.76 × 391.16
  4. Step 4: Simplify right side
    670.72x = 362,120.28
  5. Step 5: Solve for x
    x = 362,120.28/670.72
  6. Step 6: Final answer
    x = 539.90

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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.