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Finding the Fourth Proportional to 14,815.85, 20,443.64 and 8,355.20

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Solution

The fourth proportional to 14,815.85, 20,443.64 and 8,355.20 is: 11,528.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,815.85 : 20,443.64 = 8,355.20 : x
  2. Step 2: Convert to fraction form
    14,815.85/20,443.64 = 8,355.20/x
  3. Step 3: Cross multiply
    14,815.85x = 20,443.64 × 8,355.20
  4. Step 4: Simplify right side
    14,815.85x = 170,810,718.93
  5. Step 5: Solve for x
    x = 170,810,718.93/14,815.85
  6. Step 6: Final answer
    x = 11,528.92

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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.