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Finding the Fourth Proportional to 345.97, 515.77 and 318.56

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Solution

The fourth proportional to 345.97, 515.77 and 318.56 is: 474.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.97 : 515.77 = 318.56 : x
  2. Step 2: Convert to fraction form
    345.97/515.77 = 318.56/x
  3. Step 3: Cross multiply
    345.97x = 515.77 × 318.56
  4. Step 4: Simplify right side
    345.97x = 164,303.69
  5. Step 5: Solve for x
    x = 164,303.69/345.97
  6. Step 6: Final answer
    x = 474.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.