Home / 12,128.52-18,178.68-5,555.40

Finding the Fourth Proportional to 12,128.52, 18,178.68 and 5,555.40

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Solution

The fourth proportional to 12,128.52, 18,178.68 and 5,555.40 is: 8,326.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,128.52 : 18,178.68 = 5,555.40 : x
  2. Step 2: Convert to fraction form
    12,128.52/18,178.68 = 5,555.40/x
  3. Step 3: Cross multiply
    12,128.52x = 18,178.68 × 5,555.40
  4. Step 4: Simplify right side
    12,128.52x = 100,989,838.87
  5. Step 5: Solve for x
    x = 100,989,838.87/12,128.52
  6. Step 6: Final answer
    x = 8,326.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.