Home / 21,118.08-31,636.80-12,800.64

Finding the Fourth Proportional to 21,118.08, 31,636.80 and 12,800.64

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Solution

The fourth proportional to 21,118.08, 31,636.80 and 12,800.64 is: 19,176.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.08 : 31,636.80 = 12,800.64 : x
  2. Step 2: Convert to fraction form
    21,118.08/31,636.80 = 12,800.64/x
  3. Step 3: Cross multiply
    21,118.08x = 31,636.80 × 12,800.64
  4. Step 4: Simplify right side
    21,118.08x = 404,971,287.55
  5. Step 5: Solve for x
    x = 404,971,287.55/21,118.08
  6. Step 6: Final answer
    x = 19,176.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.