Home / 21,343.83-29,455.19-12,390.78

Finding the Fourth Proportional to 21,343.83, 29,455.19 and 12,390.78

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Solution

The fourth proportional to 21,343.83, 29,455.19 and 12,390.78 is: 17,099.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,343.83 : 29,455.19 = 12,390.78 : x
  2. Step 2: Convert to fraction form
    21,343.83/29,455.19 = 12,390.78/x
  3. Step 3: Cross multiply
    21,343.83x = 29,455.19 × 12,390.78
  4. Step 4: Simplify right side
    21,343.83x = 364,972,779.15
  5. Step 5: Solve for x
    x = 364,972,779.15/21,343.83
  6. Step 6: Final answer
    x = 17,099.69

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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.