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Finding the Fourth Proportional to 1,239.74, 1,873.68 and 1,218.22

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Solution

The fourth proportional to 1,239.74, 1,873.68 and 1,218.22 is: 1,841.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.74 : 1,873.68 = 1,218.22 : x
  2. Step 2: Convert to fraction form
    1,239.74/1,873.68 = 1,218.22/x
  3. Step 3: Cross multiply
    1,239.74x = 1,873.68 × 1,218.22
  4. Step 4: Simplify right side
    1,239.74x = 2,282,562.59
  5. Step 5: Solve for x
    x = 2,282,562.59/1,239.74
  6. Step 6: Final answer
    x = 1,841.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.