Home / 20,338.72-28,070.40-12,385.60

Finding the Fourth Proportional to 20,338.72, 28,070.40 and 12,385.60

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Solution

The fourth proportional to 20,338.72, 28,070.40 and 12,385.60 is: 17,093.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,338.72 : 28,070.40 = 12,385.60 : x
  2. Step 2: Convert to fraction form
    20,338.72/28,070.40 = 12,385.60/x
  3. Step 3: Cross multiply
    20,338.72x = 28,070.40 × 12,385.60
  4. Step 4: Simplify right side
    20,338.72x = 347,668,746.24
  5. Step 5: Solve for x
    x = 347,668,746.24/20,338.72
  6. Step 6: Final answer
    x = 17,093.93

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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.