Home / 15,135.92-20,887.28-8,421.32

Finding the Fourth Proportional to 15,135.92, 20,887.28 and 8,421.32

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Solution

The fourth proportional to 15,135.92, 20,887.28 and 8,421.32 is: 11,621.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.92 : 20,887.28 = 8,421.32 : x
  2. Step 2: Convert to fraction form
    15,135.92/20,887.28 = 8,421.32/x
  3. Step 3: Cross multiply
    15,135.92x = 20,887.28 × 8,421.32
  4. Step 4: Simplify right side
    15,135.92x = 175,898,468.81
  5. Step 5: Solve for x
    x = 175,898,468.81/15,135.92
  6. Step 6: Final answer
    x = 11,621.26

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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.