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Finding the Fourth Proportional to 1,212.47, 1,818.71 and 482.05

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Solution

The fourth proportional to 1,212.47, 1,818.71 and 482.05 is: 723.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.47 : 1,818.71 = 482.05 : x
  2. Step 2: Convert to fraction form
    1,212.47/1,818.71 = 482.05/x
  3. Step 3: Cross multiply
    1,212.47x = 1,818.71 × 482.05
  4. Step 4: Simplify right side
    1,212.47x = 876,709.16
  5. Step 5: Solve for x
    x = 876,709.16/1,212.47
  6. Step 6: Final answer
    x = 723.08

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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.