Home / 15,135.10-20,886.38-8,421.37

Finding the Fourth Proportional to 15,135.10, 20,886.38 and 8,421.37

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Solution

The fourth proportional to 15,135.10, 20,886.38 and 8,421.37 is: 11,621.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.10 : 20,886.38 = 8,421.37 : x
  2. Step 2: Convert to fraction form
    15,135.10/20,886.38 = 8,421.37/x
  3. Step 3: Cross multiply
    15,135.10x = 20,886.38 × 8,421.37
  4. Step 4: Simplify right side
    15,135.10x = 175,891,891.83
  5. Step 5: Solve for x
    x = 175,891,891.83/15,135.10
  6. Step 6: Final answer
    x = 11,621.46

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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.