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Finding the Fourth Proportional to 612.71, 919.19 and 320.35

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Solution

The fourth proportional to 612.71, 919.19 and 320.35 is: 480.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.71 : 919.19 = 320.35 : x
  2. Step 2: Convert to fraction form
    612.71/919.19 = 320.35/x
  3. Step 3: Cross multiply
    612.71x = 919.19 × 320.35
  4. Step 4: Simplify right side
    612.71x = 294,461.02
  5. Step 5: Solve for x
    x = 294,461.02/612.71
  6. Step 6: Final answer
    x = 480.59

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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.