Home / 1,288.24-1,929.10-1,031.20

Finding the Fourth Proportional to 1,288.24, 1,929.10 and 1,031.20

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Solution

The fourth proportional to 1,288.24, 1,929.10 and 1,031.20 is: 1,544.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.24 : 1,929.10 = 1,031.20 : x
  2. Step 2: Convert to fraction form
    1,288.24/1,929.10 = 1,031.20/x
  3. Step 3: Cross multiply
    1,288.24x = 1,929.10 × 1,031.20
  4. Step 4: Simplify right side
    1,288.24x = 1,989,287.92
  5. Step 5: Solve for x
    x = 1,989,287.92/1,288.24
  6. Step 6: Final answer
    x = 1,544.19

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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.