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Finding the Fourth Proportional to 1,212.46, 1,818.42 and 390.52

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Solution

The fourth proportional to 1,212.46, 1,818.42 and 390.52 is: 585.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.46 : 1,818.42 = 390.52 : x
  2. Step 2: Convert to fraction form
    1,212.46/1,818.42 = 390.52/x
  3. Step 3: Cross multiply
    1,212.46x = 1,818.42 × 390.52
  4. Step 4: Simplify right side
    1,212.46x = 710,129.38
  5. Step 5: Solve for x
    x = 710,129.38/1,212.46
  6. Step 6: Final answer
    x = 585.69

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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.