Home / 1,398.40-2,094.72-1,139.20

Finding the Fourth Proportional to 1,398.40, 2,094.72 and 1,139.20

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Solution

The fourth proportional to 1,398.40, 2,094.72 and 1,139.20 is: 1,706.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.40 : 2,094.72 = 1,139.20 : x
  2. Step 2: Convert to fraction form
    1,398.40/2,094.72 = 1,139.20/x
  3. Step 3: Cross multiply
    1,398.40x = 2,094.72 × 1,139.20
  4. Step 4: Simplify right side
    1,398.40x = 2,386,305.02
  5. Step 5: Solve for x
    x = 2,386,305.02/1,398.40
  6. Step 6: Final answer
    x = 1,706.45

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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.