Home / 21,422.85-29,559.99-13,459.40

Finding the Fourth Proportional to 21,422.85, 29,559.99 and 13,459.40

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Solution

The fourth proportional to 21,422.85, 29,559.99 and 13,459.40 is: 18,571.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,422.85 : 29,559.99 = 13,459.40 : x
  2. Step 2: Convert to fraction form
    21,422.85/29,559.99 = 13,459.40/x
  3. Step 3: Cross multiply
    21,422.85x = 29,559.99 × 13,459.40
  4. Step 4: Simplify right side
    21,422.85x = 397,859,655.51
  5. Step 5: Solve for x
    x = 397,859,655.51/21,422.85
  6. Step 6: Final answer
    x = 18,571.75

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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.