Home / 20,685.20-31,042.20-13,307.60

Finding the Fourth Proportional to 20,685.20, 31,042.20 and 13,307.60

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Solution

The fourth proportional to 20,685.20, 31,042.20 and 13,307.60 is: 19,970.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.20 : 31,042.20 = 13,307.60 : x
  2. Step 2: Convert to fraction form
    20,685.20/31,042.20 = 13,307.60/x
  3. Step 3: Cross multiply
    20,685.20x = 31,042.20 × 13,307.60
  4. Step 4: Simplify right side
    20,685.20x = 413,097,180.72
  5. Step 5: Solve for x
    x = 413,097,180.72/20,685.20
  6. Step 6: Final answer
    x = 19,970.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.