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Finding the Fourth Proportional to 13,859.15, 20,777.76 and 7,281.77

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Solution

The fourth proportional to 13,859.15, 20,777.76 and 7,281.77 is: 10,916.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,859.15 : 20,777.76 = 7,281.77 : x
  2. Step 2: Convert to fraction form
    13,859.15/20,777.76 = 7,281.77/x
  3. Step 3: Cross multiply
    13,859.15x = 20,777.76 × 7,281.77
  4. Step 4: Simplify right side
    13,859.15x = 151,298,765.55
  5. Step 5: Solve for x
    x = 151,298,765.55/13,859.15
  6. Step 6: Final answer
    x = 10,916.89

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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.