Home / 1,398.16-1,927.38-900.70

Finding the Fourth Proportional to 1,398.16, 1,927.38 and 900.70

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Solution

The fourth proportional to 1,398.16, 1,927.38 and 900.70 is: 1,241.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.16 : 1,927.38 = 900.70 : x
  2. Step 2: Convert to fraction form
    1,398.16/1,927.38 = 900.70/x
  3. Step 3: Cross multiply
    1,398.16x = 1,927.38 × 900.70
  4. Step 4: Simplify right side
    1,398.16x = 1,735,991.17
  5. Step 5: Solve for x
    x = 1,735,991.17/1,398.16
  6. Step 6: Final answer
    x = 1,241.63

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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.