Home / 1,398.96-2,087.10-1,273.20

Finding the Fourth Proportional to 1,398.96, 2,087.10 and 1,273.20

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Solution

The fourth proportional to 1,398.96, 2,087.10 and 1,273.20 is: 1,899.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.96 : 2,087.10 = 1,273.20 : x
  2. Step 2: Convert to fraction form
    1,398.96/2,087.10 = 1,273.20/x
  3. Step 3: Cross multiply
    1,398.96x = 2,087.10 × 1,273.20
  4. Step 4: Simplify right side
    1,398.96x = 2,657,295.72
  5. Step 5: Solve for x
    x = 2,657,295.72/1,398.96
  6. Step 6: Final answer
    x = 1,899.48

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.