Home / 21,104.78-29,124.60-12,722.90

Finding the Fourth Proportional to 21,104.78, 29,124.60 and 12,722.90

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Solution

The fourth proportional to 21,104.78, 29,124.60 and 12,722.90 is: 17,557.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,104.78 : 29,124.60 = 12,722.90 : x
  2. Step 2: Convert to fraction form
    21,104.78/29,124.60 = 12,722.90/x
  3. Step 3: Cross multiply
    21,104.78x = 29,124.60 × 12,722.90
  4. Step 4: Simplify right side
    21,104.78x = 370,549,373.34
  5. Step 5: Solve for x
    x = 370,549,373.34/21,104.78
  6. Step 6: Final answer
    x = 17,557.60

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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.