Home / 21,247.90-31,838.55-13,440.22

Finding the Fourth Proportional to 21,247.90, 31,838.55 and 13,440.22

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Solution

The fourth proportional to 21,247.90, 31,838.55 and 13,440.22 is: 20,139.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,247.90 : 31,838.55 = 13,440.22 : x
  2. Step 2: Convert to fraction form
    21,247.90/31,838.55 = 13,440.22/x
  3. Step 3: Cross multiply
    21,247.90x = 31,838.55 × 13,440.22
  4. Step 4: Simplify right side
    21,247.90x = 427,917,116.48
  5. Step 5: Solve for x
    x = 427,917,116.48/21,247.90
  6. Step 6: Final answer
    x = 20,139.27

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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.