Home / 1,398.20-2,087.96-1,317.20

Finding the Fourth Proportional to 1,398.20, 2,087.96 and 1,317.20

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Solution

The fourth proportional to 1,398.20, 2,087.96 and 1,317.20 is: 1,967.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.20 : 2,087.96 = 1,317.20 : x
  2. Step 2: Convert to fraction form
    1,398.20/2,087.96 = 1,317.20/x
  3. Step 3: Cross multiply
    1,398.20x = 2,087.96 × 1,317.20
  4. Step 4: Simplify right side
    1,398.20x = 2,750,243.89
  5. Step 5: Solve for x
    x = 2,750,243.89/1,398.20
  6. Step 6: Final answer
    x = 1,967.00

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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.