Home / 21,128.67-29,161.89-14,432.81

Finding the Fourth Proportional to 21,128.67, 29,161.89 and 14,432.81

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Solution

The fourth proportional to 21,128.67, 29,161.89 and 14,432.81 is: 19,920.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.67 : 29,161.89 = 14,432.81 : x
  2. Step 2: Convert to fraction form
    21,128.67/29,161.89 = 14,432.81/x
  3. Step 3: Cross multiply
    21,128.67x = 29,161.89 × 14,432.81
  4. Step 4: Simplify right side
    21,128.67x = 420,887,871.80
  5. Step 5: Solve for x
    x = 420,887,871.80/21,128.67
  6. Step 6: Final answer
    x = 19,920.23

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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.