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Finding the Fourth Proportional to 8,931.11, 13,378.41 and 7,620.75

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Solution

The fourth proportional to 8,931.11, 13,378.41 and 7,620.75 is: 11,415.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,931.11 : 13,378.41 = 7,620.75 : x
  2. Step 2: Convert to fraction form
    8,931.11/13,378.41 = 7,620.75/x
  3. Step 3: Cross multiply
    8,931.11x = 13,378.41 × 7,620.75
  4. Step 4: Simplify right side
    8,931.11x = 101,953,518.01
  5. Step 5: Solve for x
    x = 101,953,518.01/8,931.11
  6. Step 6: Final answer
    x = 11,415.55

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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.