Home / 15,129.28-20,878.36-8,415.60

Finding the Fourth Proportional to 15,129.28, 20,878.36 and 8,415.60

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Solution

The fourth proportional to 15,129.28, 20,878.36 and 8,415.60 is: 11,613.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,129.28 : 20,878.36 = 8,415.60 : x
  2. Step 2: Convert to fraction form
    15,129.28/20,878.36 = 8,415.60/x
  3. Step 3: Cross multiply
    15,129.28x = 20,878.36 × 8,415.60
  4. Step 4: Simplify right side
    15,129.28x = 175,703,827.08
  5. Step 5: Solve for x
    x = 175,703,827.08/15,129.28
  6. Step 6: Final answer
    x = 11,613.49

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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.