Home / 21,272.78-29,359.70-12,779.62

Finding the Fourth Proportional to 21,272.78, 29,359.70 and 12,779.62

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Solution

The fourth proportional to 21,272.78, 29,359.70 and 12,779.62 is: 17,637.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,272.78 : 29,359.70 = 12,779.62 : x
  2. Step 2: Convert to fraction form
    21,272.78/29,359.70 = 12,779.62/x
  3. Step 3: Cross multiply
    21,272.78x = 29,359.70 × 12,779.62
  4. Step 4: Simplify right side
    21,272.78x = 375,205,809.31
  5. Step 5: Solve for x
    x = 375,205,809.31/21,272.78
  6. Step 6: Final answer
    x = 17,637.84

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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.