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Finding the Fourth Proportional to 315.11, 434.58 and 283.70

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Solution

The fourth proportional to 315.11, 434.58 and 283.70 is: 391.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.11 : 434.58 = 283.70 : x
  2. Step 2: Convert to fraction form
    315.11/434.58 = 283.70/x
  3. Step 3: Cross multiply
    315.11x = 434.58 × 283.70
  4. Step 4: Simplify right side
    315.11x = 123,290.35
  5. Step 5: Solve for x
    x = 123,290.35/315.11
  6. Step 6: Final answer
    x = 391.26

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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.