Home / 1,239.08-1,854.78-979.88

Finding the Fourth Proportional to 1,239.08, 1,854.78 and 979.88

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Solution

The fourth proportional to 1,239.08, 1,854.78 and 979.88 is: 1,466.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.08 : 1,854.78 = 979.88 : x
  2. Step 2: Convert to fraction form
    1,239.08/1,854.78 = 979.88/x
  3. Step 3: Cross multiply
    1,239.08x = 1,854.78 × 979.88
  4. Step 4: Simplify right side
    1,239.08x = 1,817,461.83
  5. Step 5: Solve for x
    x = 1,817,461.83/1,239.08
  6. Step 6: Final answer
    x = 1,466.78

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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.