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Finding the Fourth Proportional to 609.40, 840.99 and 347.42

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Solution

The fourth proportional to 609.40, 840.99 and 347.42 is: 479.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.40 : 840.99 = 347.42 : x
  2. Step 2: Convert to fraction form
    609.40/840.99 = 347.42/x
  3. Step 3: Cross multiply
    609.40x = 840.99 × 347.42
  4. Step 4: Simplify right side
    609.40x = 292,176.75
  5. Step 5: Solve for x
    x = 292,176.75/609.40
  6. Step 6: Final answer
    x = 479.45

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1.5x scale

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.