Home / 20,611.48-28,412.28-12,638.92

Finding the Fourth Proportional to 20,611.48, 28,412.28 and 12,638.92

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Solution

The fourth proportional to 20,611.48, 28,412.28 and 12,638.92 is: 17,422.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,611.48 : 28,412.28 = 12,638.92 : x
  2. Step 2: Convert to fraction form
    20,611.48/28,412.28 = 12,638.92/x
  3. Step 3: Cross multiply
    20,611.48x = 28,412.28 × 12,638.92
  4. Step 4: Simplify right side
    20,611.48x = 359,100,533.94
  5. Step 5: Solve for x
    x = 359,100,533.94/20,611.48
  6. Step 6: Final answer
    x = 17,422.36

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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.