Home / 1,389.30-2,079.90-927.60

Finding the Fourth Proportional to 1,389.30, 2,079.90 and 927.60

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Solution

The fourth proportional to 1,389.30, 2,079.90 and 927.60 is: 1,388.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.30 : 2,079.90 = 927.60 : x
  2. Step 2: Convert to fraction form
    1,389.30/2,079.90 = 927.60/x
  3. Step 3: Cross multiply
    1,389.30x = 2,079.90 × 927.60
  4. Step 4: Simplify right side
    1,389.30x = 1,929,315.24
  5. Step 5: Solve for x
    x = 1,929,315.24/1,389.30
  6. Step 6: Final answer
    x = 1,388.70

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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.