Home / 20,985.38-28,951.15-12,485.80

Finding the Fourth Proportional to 20,985.38, 28,951.15 and 12,485.80

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Solution

The fourth proportional to 20,985.38, 28,951.15 and 12,485.80 is: 17,225.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.38 : 28,951.15 = 12,485.80 : x
  2. Step 2: Convert to fraction form
    20,985.38/28,951.15 = 12,485.80/x
  3. Step 3: Cross multiply
    20,985.38x = 28,951.15 × 12,485.80
  4. Step 4: Simplify right side
    20,985.38x = 361,478,309.83
  5. Step 5: Solve for x
    x = 361,478,309.83/20,985.38
  6. Step 6: Final answer
    x = 17,225.24

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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.