Home / 8,919.95-12,309.57-5,781.60

Finding the Fourth Proportional to 8,919.95, 12,309.57 and 5,781.60

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Solution

The fourth proportional to 8,919.95, 12,309.57 and 5,781.60 is: 7,978.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.95 : 12,309.57 = 5,781.60 : x
  2. Step 2: Convert to fraction form
    8,919.95/12,309.57 = 5,781.60/x
  3. Step 3: Cross multiply
    8,919.95x = 12,309.57 × 5,781.60
  4. Step 4: Simplify right side
    8,919.95x = 71,169,009.91
  5. Step 5: Solve for x
    x = 71,169,009.91/8,919.95
  6. Step 6: Final answer
    x = 7,978.64

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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.