Home / 21,115.08-29,141.88-13,159.80

Finding the Fourth Proportional to 21,115.08, 29,141.88 and 13,159.80

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Solution

The fourth proportional to 21,115.08, 29,141.88 and 13,159.80 is: 18,162.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.08 : 29,141.88 = 13,159.80 : x
  2. Step 2: Convert to fraction form
    21,115.08/29,141.88 = 13,159.80/x
  3. Step 3: Cross multiply
    21,115.08x = 29,141.88 × 13,159.80
  4. Step 4: Simplify right side
    21,115.08x = 383,501,312.42
  5. Step 5: Solve for x
    x = 383,501,312.42/21,115.08
  6. Step 6: Final answer
    x = 18,162.44

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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.