Home / 20,458.72-28,235.20-12,505.60

Finding the Fourth Proportional to 20,458.72, 28,235.20 and 12,505.60

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Solution

The fourth proportional to 20,458.72, 28,235.20 and 12,505.60 is: 17,259.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,458.72 : 28,235.20 = 12,505.60 : x
  2. Step 2: Convert to fraction form
    20,458.72/28,235.20 = 12,505.60/x
  3. Step 3: Cross multiply
    20,458.72x = 28,235.20 × 12,505.60
  4. Step 4: Simplify right side
    20,458.72x = 353,098,117.12
  5. Step 5: Solve for x
    x = 353,098,117.12/20,458.72
  6. Step 6: Final answer
    x = 17,259.05

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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.