Home / 21,120.65-29,153.79-12,171.72

Finding the Fourth Proportional to 21,120.65, 29,153.79 and 12,171.72

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Solution

The fourth proportional to 21,120.65, 29,153.79 and 12,171.72 is: 16,801.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.65 : 29,153.79 = 12,171.72 : x
  2. Step 2: Convert to fraction form
    21,120.65/29,153.79 = 12,171.72/x
  3. Step 3: Cross multiply
    21,120.65x = 29,153.79 × 12,171.72
  4. Step 4: Simplify right side
    21,120.65x = 354,851,768.82
  5. Step 5: Solve for x
    x = 354,851,768.82/21,120.65
  6. Step 6: Final answer
    x = 16,801.18

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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.