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Finding the Fourth Proportional to 484.91, 669.16 and 307.79

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Solution

The fourth proportional to 484.91, 669.16 and 307.79 is: 424.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.91 : 669.16 = 307.79 : x
  2. Step 2: Convert to fraction form
    484.91/669.16 = 307.79/x
  3. Step 3: Cross multiply
    484.91x = 669.16 × 307.79
  4. Step 4: Simplify right side
    484.91x = 205,960.76
  5. Step 5: Solve for x
    x = 205,960.76/484.91
  6. Step 6: Final answer
    x = 424.74

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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.