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Finding the Fourth Proportional to 8,919.60, 13,392.87 and 7,085.58

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Solution

The fourth proportional to 8,919.60, 13,392.87 and 7,085.58 is: 10,639.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.60 : 13,392.87 = 7,085.58 : x
  2. Step 2: Convert to fraction form
    8,919.60/13,392.87 = 7,085.58/x
  3. Step 3: Cross multiply
    8,919.60x = 13,392.87 × 7,085.58
  4. Step 4: Simplify right side
    8,919.60x = 94,896,251.81
  5. Step 5: Solve for x
    x = 94,896,251.81/8,919.60
  6. Step 6: Final answer
    x = 10,639.07

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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.