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Finding the Fourth Proportional to 670.71, 925.71 and 405.36

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Solution

The fourth proportional to 670.71, 925.71 and 405.36 is: 559.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.71 : 925.71 = 405.36 : x
  2. Step 2: Convert to fraction form
    670.71/925.71 = 405.36/x
  3. Step 3: Cross multiply
    670.71x = 925.71 × 405.36
  4. Step 4: Simplify right side
    670.71x = 375,245.81
  5. Step 5: Solve for x
    x = 375,245.81/670.71
  6. Step 6: Final answer
    x = 559.48

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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.