Home / 1,212.10-1,818.95-442.60

Finding the Fourth Proportional to 1,212.10, 1,818.95 and 442.60

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Solution

The fourth proportional to 1,212.10, 1,818.95 and 442.60 is: 664.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.10 : 1,818.95 = 442.60 : x
  2. Step 2: Convert to fraction form
    1,212.10/1,818.95 = 442.60/x
  3. Step 3: Cross multiply
    1,212.10x = 1,818.95 × 442.60
  4. Step 4: Simplify right side
    1,212.10x = 805,055.96
  5. Step 5: Solve for x
    x = 805,055.96/1,212.10
  6. Step 6: Final answer
    x = 664.19

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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.