Home / 8,921.88-12,312.19-5,385.09

Finding the Fourth Proportional to 8,921.88, 12,312.19 and 5,385.09

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Solution

The fourth proportional to 8,921.88, 12,312.19 and 5,385.09 is: 7,431.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,921.88 : 12,312.19 = 5,385.09 : x
  2. Step 2: Convert to fraction form
    8,921.88/12,312.19 = 5,385.09/x
  3. Step 3: Cross multiply
    8,921.88x = 12,312.19 × 5,385.09
  4. Step 4: Simplify right side
    8,921.88x = 66,302,251.25
  5. Step 5: Solve for x
    x = 66,302,251.25/8,921.88
  6. Step 6: Final answer
    x = 7,431.42

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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.