Home / 1,212.30-1,818.90-482.40

Finding the Fourth Proportional to 1,212.30, 1,818.90 and 482.40

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Solution

The fourth proportional to 1,212.30, 1,818.90 and 482.40 is: 723.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.30 : 1,818.90 = 482.40 : x
  2. Step 2: Convert to fraction form
    1,212.30/1,818.90 = 482.40/x
  3. Step 3: Cross multiply
    1,212.30x = 1,818.90 × 482.40
  4. Step 4: Simplify right side
    1,212.30x = 877,437.36
  5. Step 5: Solve for x
    x = 877,437.36/1,212.30
  6. Step 6: Final answer
    x = 723.78

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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.