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Finding the Fourth Proportional to 474.90, 655.35 and 309.18

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Solution

The fourth proportional to 474.90, 655.35 and 309.18 is: 426.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.90 : 655.35 = 309.18 : x
  2. Step 2: Convert to fraction form
    474.90/655.35 = 309.18/x
  3. Step 3: Cross multiply
    474.90x = 655.35 × 309.18
  4. Step 4: Simplify right side
    474.90x = 202,621.11
  5. Step 5: Solve for x
    x = 202,621.11/474.90
  6. Step 6: Final answer
    x = 426.66

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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.