Home / 1,239.10-1,854.99-1,031.78

Finding the Fourth Proportional to 1,239.10, 1,854.99 and 1,031.78

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Solution

The fourth proportional to 1,239.10, 1,854.99 and 1,031.78 is: 1,544.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.10 : 1,854.99 = 1,031.78 : x
  2. Step 2: Convert to fraction form
    1,239.10/1,854.99 = 1,031.78/x
  3. Step 3: Cross multiply
    1,239.10x = 1,854.99 × 1,031.78
  4. Step 4: Simplify right side
    1,239.10x = 1,913,941.58
  5. Step 5: Solve for x
    x = 1,913,941.58/1,239.10
  6. Step 6: Final answer
    x = 1,544.62

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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.