Home / 21,126.76-29,128.40-13,559.72

Finding the Fourth Proportional to 21,126.76, 29,128.40 and 13,559.72

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Solution

The fourth proportional to 21,126.76, 29,128.40 and 13,559.72 is: 18,695.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,126.76 : 29,128.40 = 13,559.72 : x
  2. Step 2: Convert to fraction form
    21,126.76/29,128.40 = 13,559.72/x
  3. Step 3: Cross multiply
    21,126.76x = 29,128.40 × 13,559.72
  4. Step 4: Simplify right side
    21,126.76x = 394,972,948.05
  5. Step 5: Solve for x
    x = 394,972,948.05/21,126.76
  6. Step 6: Final answer
    x = 18,695.39

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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.