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Finding the Fourth Proportional to 315.65, 472.61 and 286.83

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Solution

The fourth proportional to 315.65, 472.61 and 286.83 is: 429.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.65 : 472.61 = 286.83 : x
  2. Step 2: Convert to fraction form
    315.65/472.61 = 286.83/x
  3. Step 3: Cross multiply
    315.65x = 472.61 × 286.83
  4. Step 4: Simplify right side
    315.65x = 135,557.29
  5. Step 5: Solve for x
    x = 135,557.29/315.65
  6. Step 6: Final answer
    x = 429.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.