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Finding the Fourth Proportional to 670.67, 925.37 and 405.15

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Solution

The fourth proportional to 670.67, 925.37 and 405.15 is: 559.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.67 : 925.37 = 405.15 : x
  2. Step 2: Convert to fraction form
    670.67/925.37 = 405.15/x
  3. Step 3: Cross multiply
    670.67x = 925.37 × 405.15
  4. Step 4: Simplify right side
    670.67x = 374,913.66
  5. Step 5: Solve for x
    x = 374,913.66/670.67
  6. Step 6: Final answer
    x = 559.01

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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.