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Finding the Fourth Proportional to 475, 655.05 and 309.34

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Solution

The fourth proportional to 475, 655.05 and 309.34 is: 426.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    475 : 655.05 = 309.34 : x
  2. Step 2: Convert to fraction form
    475/655.05 = 309.34/x
  3. Step 3: Cross multiply
    475x = 655.05 × 309.34
  4. Step 4: Simplify right side
    475x = 202,633.17
  5. Step 5: Solve for x
    x = 202,633.17/475
  6. Step 6: Final answer
    x = 426.60

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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.