Home / 15,135.27-20,885.47-8,420.50

Finding the Fourth Proportional to 15,135.27, 20,885.47 and 8,420.50

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Solution

The fourth proportional to 15,135.27, 20,885.47 and 8,420.50 is: 11,619.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.27 : 20,885.47 = 8,420.50 : x
  2. Step 2: Convert to fraction form
    15,135.27/20,885.47 = 8,420.50/x
  3. Step 3: Cross multiply
    15,135.27x = 20,885.47 × 8,420.50
  4. Step 4: Simplify right side
    15,135.27x = 175,866,100.14
  5. Step 5: Solve for x
    x = 175,866,100.14/15,135.27
  6. Step 6: Final answer
    x = 11,619.62

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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.