Home / 1,490.75-2,055.30-1,224.20

Finding the Fourth Proportional to 1,490.75, 2,055.30 and 1,224.20

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Solution

The fourth proportional to 1,490.75, 2,055.30 and 1,224.20 is: 1,687.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.75 : 2,055.30 = 1,224.20 : x
  2. Step 2: Convert to fraction form
    1,490.75/2,055.30 = 1,224.20/x
  3. Step 3: Cross multiply
    1,490.75x = 2,055.30 × 1,224.20
  4. Step 4: Simplify right side
    1,490.75x = 2,516,098.26
  5. Step 5: Solve for x
    x = 2,516,098.26/1,490.75
  6. Step 6: Final answer
    x = 1,687.81

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Double scale
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1.5x scale

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.