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Finding the Fourth Proportional to 474.84, 655.50 and 309.28

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Solution

The fourth proportional to 474.84, 655.50 and 309.28 is: 426.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.84 : 655.50 = 309.28 : x
  2. Step 2: Convert to fraction form
    474.84/655.50 = 309.28/x
  3. Step 3: Cross multiply
    474.84x = 655.50 × 309.28
  4. Step 4: Simplify right side
    474.84x = 202,733.04
  5. Step 5: Solve for x
    x = 202,733.04/474.84
  6. Step 6: Final answer
    x = 426.95

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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.