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Finding the Fourth Proportional to 346.62, 477.32 and 309.77

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Solution

The fourth proportional to 346.62, 477.32 and 309.77 is: 426.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.62 : 477.32 = 309.77 : x
  2. Step 2: Convert to fraction form
    346.62/477.32 = 309.77/x
  3. Step 3: Cross multiply
    346.62x = 477.32 × 309.77
  4. Step 4: Simplify right side
    346.62x = 147,855.48
  5. Step 5: Solve for x
    x = 147,855.48/346.62
  6. Step 6: Final answer
    x = 426.56

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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.