Home / 21,111.71-29,137.73-12,157.56

Finding the Fourth Proportional to 21,111.71, 29,137.73 and 12,157.56

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Solution

The fourth proportional to 21,111.71, 29,137.73 and 12,157.56 is: 16,779.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,111.71 : 29,137.73 = 12,157.56 : x
  2. Step 2: Convert to fraction form
    21,111.71/29,137.73 = 12,157.56/x
  3. Step 3: Cross multiply
    21,111.71x = 29,137.73 × 12,157.56
  4. Step 4: Simplify right side
    21,111.71x = 354,243,639.95
  5. Step 5: Solve for x
    x = 354,243,639.95/21,111.71
  6. Step 6: Final answer
    x = 16,779.49

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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.