Home / 8,921.85-12,312.66-5,385.59

Finding the Fourth Proportional to 8,921.85, 12,312.66 and 5,385.59

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Solution

The fourth proportional to 8,921.85, 12,312.66 and 5,385.59 is: 7,432.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,921.85 : 12,312.66 = 5,385.59 : x
  2. Step 2: Convert to fraction form
    8,921.85/12,312.66 = 5,385.59/x
  3. Step 3: Cross multiply
    8,921.85x = 12,312.66 × 5,385.59
  4. Step 4: Simplify right side
    8,921.85x = 66,310,913.08
  5. Step 5: Solve for x
    x = 66,310,913.08/8,921.85
  6. Step 6: Final answer
    x = 7,432.42

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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.