Home / 15,135.66-20,887.31-8,421.57

Finding the Fourth Proportional to 15,135.66, 20,887.31 and 8,421.57

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Solution

The fourth proportional to 15,135.66, 20,887.31 and 8,421.57 is: 11,621.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.66 : 20,887.31 = 8,421.57 : x
  2. Step 2: Convert to fraction form
    15,135.66/20,887.31 = 8,421.57/x
  3. Step 3: Cross multiply
    15,135.66x = 20,887.31 × 8,421.57
  4. Step 4: Simplify right side
    15,135.66x = 175,903,901.59
  5. Step 5: Solve for x
    x = 175,903,901.59/15,135.66
  6. Step 6: Final answer
    x = 11,621.82

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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.