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Finding the Fourth Proportional to 21,590.80, 29,794.80 and 12,159.40

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Solution

The fourth proportional to 21,590.80, 29,794.80 and 12,159.40 is: 16,779.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,590.80 : 29,794.80 = 12,159.40 : x
  2. Step 2: Convert to fraction form
    21,590.80/29,794.80 = 12,159.40/x
  3. Step 3: Cross multiply
    21,590.80x = 29,794.80 × 12,159.40
  4. Step 4: Simplify right side
    21,590.80x = 362,286,891.12
  5. Step 5: Solve for x
    x = 362,286,891.12/21,590.80
  6. Step 6: Final answer
    x = 16,779.69

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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.