Home / 21,159.70-29,187.12-13,615.84

Finding the Fourth Proportional to 21,159.70, 29,187.12 and 13,615.84

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Solution

The fourth proportional to 21,159.70, 29,187.12 and 13,615.84 is: 18,781.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,159.70 : 29,187.12 = 13,615.84 : x
  2. Step 2: Convert to fraction form
    21,159.70/29,187.12 = 13,615.84/x
  3. Step 3: Cross multiply
    21,159.70x = 29,187.12 × 13,615.84
  4. Step 4: Simplify right side
    21,159.70x = 397,407,155.98
  5. Step 5: Solve for x
    x = 397,407,155.98/21,159.70
  6. Step 6: Final answer
    x = 18,781.32

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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.