Home / 1,422.37-2,129.10-921.37

Finding the Fourth Proportional to 1,422.37, 2,129.10 and 921.37

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Solution

The fourth proportional to 1,422.37, 2,129.10 and 921.37 is: 1,379.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.37 : 2,129.10 = 921.37 : x
  2. Step 2: Convert to fraction form
    1,422.37/2,129.10 = 921.37/x
  3. Step 3: Cross multiply
    1,422.37x = 2,129.10 × 921.37
  4. Step 4: Simplify right side
    1,422.37x = 1,961,688.87
  5. Step 5: Solve for x
    x = 1,961,688.87/1,422.37
  6. Step 6: Final answer
    x = 1,379.17

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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.