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Finding the Fourth Proportional to 609.42, 841.26 and 388.65

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Solution

The fourth proportional to 609.42, 841.26 and 388.65 is: 536.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.42 : 841.26 = 388.65 : x
  2. Step 2: Convert to fraction form
    609.42/841.26 = 388.65/x
  3. Step 3: Cross multiply
    609.42x = 841.26 × 388.65
  4. Step 4: Simplify right side
    609.42x = 326,955.70
  5. Step 5: Solve for x
    x = 326,955.70/609.42
  6. Step 6: Final answer
    x = 536.50

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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.