Home / 1,553.39-2,143.68-890.28

Finding the Fourth Proportional to 1,553.39, 2,143.68 and 890.28

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Solution

The fourth proportional to 1,553.39, 2,143.68 and 890.28 is: 1,228.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.39 : 2,143.68 = 890.28 : x
  2. Step 2: Convert to fraction form
    1,553.39/2,143.68 = 890.28/x
  3. Step 3: Cross multiply
    1,553.39x = 2,143.68 × 890.28
  4. Step 4: Simplify right side
    1,553.39x = 1,908,478.77
  5. Step 5: Solve for x
    x = 1,908,478.77/1,553.39
  6. Step 6: Final answer
    x = 1,228.59

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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.