Home / 2,156.48-2,976-1,225.20

Finding the Fourth Proportional to 2,156.48, 2,976 and 1,225.20

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Solution

The fourth proportional to 2,156.48, 2,976 and 1,225.20 is: 1,690.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,156.48 : 2,976 = 1,225.20 : x
  2. Step 2: Convert to fraction form
    2,156.48/2,976 = 1,225.20/x
  3. Step 3: Cross multiply
    2,156.48x = 2,976 × 1,225.20
  4. Step 4: Simplify right side
    2,156.48x = 3,646,195.20
  5. Step 5: Solve for x
    x = 3,646,195.20/2,156.48
  6. Step 6: Final answer
    x = 1,690.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.