Home / 1,553.07-2,142.90-890.13

Finding the Fourth Proportional to 1,553.07, 2,142.90 and 890.13

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Solution

The fourth proportional to 1,553.07, 2,142.90 and 890.13 is: 1,228.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.07 : 2,142.90 = 890.13 : x
  2. Step 2: Convert to fraction form
    1,553.07/2,142.90 = 890.13/x
  3. Step 3: Cross multiply
    1,553.07x = 2,142.90 × 890.13
  4. Step 4: Simplify right side
    1,553.07x = 1,907,459.58
  5. Step 5: Solve for x
    x = 1,907,459.58/1,553.07
  6. Step 6: Final answer
    x = 1,228.19

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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.