Home / 20,485.85-28,264.28-12,519.77

Finding the Fourth Proportional to 20,485.85, 28,264.28 and 12,519.77

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Solution

The fourth proportional to 20,485.85, 28,264.28 and 12,519.77 is: 17,273.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,485.85 : 28,264.28 = 12,519.77 : x
  2. Step 2: Convert to fraction form
    20,485.85/28,264.28 = 12,519.77/x
  3. Step 3: Cross multiply
    20,485.85x = 28,264.28 × 12,519.77
  4. Step 4: Simplify right side
    20,485.85x = 353,862,080.90
  5. Step 5: Solve for x
    x = 353,862,080.90/20,485.85
  6. Step 6: Final answer
    x = 17,273.49

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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.