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Finding the Fourth Proportional to 345.93, 477.08 and 309.48

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Solution

The fourth proportional to 345.93, 477.08 and 309.48 is: 426.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.93 : 477.08 = 309.48 : x
  2. Step 2: Convert to fraction form
    345.93/477.08 = 309.48/x
  3. Step 3: Cross multiply
    345.93x = 477.08 × 309.48
  4. Step 4: Simplify right side
    345.93x = 147,645.17
  5. Step 5: Solve for x
    x = 147,645.17/345.93
  6. Step 6: Final answer
    x = 426.81

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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.