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Finding the Fourth Proportional to 612.68, 919.56 and 439.34

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Solution

The fourth proportional to 612.68, 919.56 and 439.34 is: 659.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.68 : 919.56 = 439.34 : x
  2. Step 2: Convert to fraction form
    612.68/919.56 = 439.34/x
  3. Step 3: Cross multiply
    612.68x = 919.56 × 439.34
  4. Step 4: Simplify right side
    612.68x = 403,999.49
  5. Step 5: Solve for x
    x = 403,999.49/612.68
  6. Step 6: Final answer
    x = 659.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.