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Finding the Fourth Proportional to 670.91, 923.75 and 609.40

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Solution

The fourth proportional to 670.91, 923.75 and 609.40 is: 839.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.91 : 923.75 = 609.40 : x
  2. Step 2: Convert to fraction form
    670.91/923.75 = 609.40/x
  3. Step 3: Cross multiply
    670.91x = 923.75 × 609.40
  4. Step 4: Simplify right side
    670.91x = 562,933.64
  5. Step 5: Solve for x
    x = 562,933.64/670.91
  6. Step 6: Final answer
    x = 839.06

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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.