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Finding the Fourth Proportional to 670.65, 925.49 and 422.39

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Solution

The fourth proportional to 670.65, 925.49 and 422.39 is: 582.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.65 : 925.49 = 422.39 : x
  2. Step 2: Convert to fraction form
    670.65/925.49 = 422.39/x
  3. Step 3: Cross multiply
    670.65x = 925.49 × 422.39
  4. Step 4: Simplify right side
    670.65x = 390,916.71
  5. Step 5: Solve for x
    x = 390,916.71/670.65
  6. Step 6: Final answer
    x = 582.89

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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.