Home / 1,398.11-1,929.82-900.75

Finding the Fourth Proportional to 1,398.11, 1,929.82 and 900.75

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Solution

The fourth proportional to 1,398.11, 1,929.82 and 900.75 is: 1,243.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.11 : 1,929.82 = 900.75 : x
  2. Step 2: Convert to fraction form
    1,398.11/1,929.82 = 900.75/x
  3. Step 3: Cross multiply
    1,398.11x = 1,929.82 × 900.75
  4. Step 4: Simplify right side
    1,398.11x = 1,738,288.10
  5. Step 5: Solve for x
    x = 1,738,288.10/1,398.11
  6. Step 6: Final answer
    x = 1,243.31

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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.