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Finding the Fourth Proportional to 515.63, 711.68 and 305.93

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Solution

The fourth proportional to 515.63, 711.68 and 305.93 is: 422.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.63 : 711.68 = 305.93 : x
  2. Step 2: Convert to fraction form
    515.63/711.68 = 305.93/x
  3. Step 3: Cross multiply
    515.63x = 711.68 × 305.93
  4. Step 4: Simplify right side
    515.63x = 217,721.32
  5. Step 5: Solve for x
    x = 217,721.32/515.63
  6. Step 6: Final answer
    x = 422.24

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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.