Home / 15,135.34-20,887.01-8,421.05

Finding the Fourth Proportional to 15,135.34, 20,887.01 and 8,421.05

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Solution

The fourth proportional to 15,135.34, 20,887.01 and 8,421.05 is: 11,621.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.34 : 20,887.01 = 8,421.05 : x
  2. Step 2: Convert to fraction form
    15,135.34/20,887.01 = 8,421.05/x
  3. Step 3: Cross multiply
    15,135.34x = 20,887.01 × 8,421.05
  4. Step 4: Simplify right side
    15,135.34x = 175,890,451.13
  5. Step 5: Solve for x
    x = 175,890,451.13/15,135.34
  6. Step 6: Final answer
    x = 11,621.18

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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.