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Finding the Fourth Proportional to 474.84, 654.86 and 309

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Solution

The fourth proportional to 474.84, 654.86 and 309 is: 426.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.84 : 654.86 = 309 : x
  2. Step 2: Convert to fraction form
    474.84/654.86 = 309/x
  3. Step 3: Cross multiply
    474.84x = 654.86 × 309
  4. Step 4: Simplify right side
    474.84x = 202,350.20
  5. Step 5: Solve for x
    x = 202,350.20/474.84
  6. Step 6: Final answer
    x = 426.14

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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.