Home / 15,120.77-20,864.39-8,406.45

Finding the Fourth Proportional to 15,120.77, 20,864.39 and 8,406.45

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Solution

The fourth proportional to 15,120.77, 20,864.39 and 8,406.45 is: 11,599.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,120.77 : 20,864.39 = 8,406.45 : x
  2. Step 2: Convert to fraction form
    15,120.77/20,864.39 = 8,406.45/x
  3. Step 3: Cross multiply
    15,120.77x = 20,864.39 × 8,406.45
  4. Step 4: Simplify right side
    15,120.77x = 175,395,409.28
  5. Step 5: Solve for x
    x = 175,395,409.28/15,120.77
  6. Step 6: Final answer
    x = 11,599.64

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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.