Home / 1,347.21-2,021.09-422.91

Finding the Fourth Proportional to 1,347.21, 2,021.09 and 422.91

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Solution

The fourth proportional to 1,347.21, 2,021.09 and 422.91 is: 634.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.21 : 2,021.09 = 422.91 : x
  2. Step 2: Convert to fraction form
    1,347.21/2,021.09 = 422.91/x
  3. Step 3: Cross multiply
    1,347.21x = 2,021.09 × 422.91
  4. Step 4: Simplify right side
    1,347.21x = 854,737.06
  5. Step 5: Solve for x
    x = 854,737.06/1,347.21
  6. Step 6: Final answer
    x = 634.45

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1.5x scale

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.