Home / 21,375.78-29,498.93-12,420.02

Finding the Fourth Proportional to 21,375.78, 29,498.93 and 12,420.02

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Solution

The fourth proportional to 21,375.78, 29,498.93 and 12,420.02 is: 17,139.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,375.78 : 29,498.93 = 12,420.02 : x
  2. Step 2: Convert to fraction form
    21,375.78/29,498.93 = 12,420.02/x
  3. Step 3: Cross multiply
    21,375.78x = 29,498.93 × 12,420.02
  4. Step 4: Simplify right side
    21,375.78x = 366,377,090.98
  5. Step 5: Solve for x
    x = 366,377,090.98/21,375.78
  6. Step 6: Final answer
    x = 17,139.82

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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.