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Finding the Fourth Proportional to 670.58, 925.38 and 390.86

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Solution

The fourth proportional to 670.58, 925.38 and 390.86 is: 539.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.58 : 925.38 = 390.86 : x
  2. Step 2: Convert to fraction form
    670.58/925.38 = 390.86/x
  3. Step 3: Cross multiply
    670.58x = 925.38 × 390.86
  4. Step 4: Simplify right side
    670.58x = 361,689.40
  5. Step 5: Solve for x
    x = 361,689.40/670.58
  6. Step 6: Final answer
    x = 539.37

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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.