Home / 13,615.20-20,420.80-4,253.04

Finding the Fourth Proportional to 13,615.20, 20,420.80 and 4,253.04

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Solution

The fourth proportional to 13,615.20, 20,420.80 and 4,253.04 is: 6,378.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,615.20 : 20,420.80 = 4,253.04 : x
  2. Step 2: Convert to fraction form
    13,615.20/20,420.80 = 4,253.04/x
  3. Step 3: Cross multiply
    13,615.20x = 20,420.80 × 4,253.04
  4. Step 4: Simplify right side
    13,615.20x = 86,850,479.23
  5. Step 5: Solve for x
    x = 86,850,479.23/13,615.20
  6. Step 6: Final answer
    x = 6,378.94

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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.