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Finding the Fourth Proportional to 14,605.20, 20,155.16 and 7,890.81

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Solution

The fourth proportional to 14,605.20, 20,155.16 and 7,890.81 is: 10,889.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,605.20 : 20,155.16 = 7,890.81 : x
  2. Step 2: Convert to fraction form
    14,605.20/20,155.16 = 7,890.81/x
  3. Step 3: Cross multiply
    14,605.20x = 20,155.16 × 7,890.81
  4. Step 4: Simplify right side
    14,605.20x = 159,040,498.63
  5. Step 5: Solve for x
    x = 159,040,498.63/14,605.20
  6. Step 6: Final answer
    x = 10,889.30

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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.