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Finding the Fourth Proportional to 13,556.60, 18,700.52 and 7,890.68

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Solution

The fourth proportional to 13,556.60, 18,700.52 and 7,890.68 is: 10,884.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,556.60 : 18,700.52 = 7,890.68 : x
  2. Step 2: Convert to fraction form
    13,556.60/18,700.52 = 7,890.68/x
  3. Step 3: Cross multiply
    13,556.60x = 18,700.52 × 7,890.68
  4. Step 4: Simplify right side
    13,556.60x = 147,559,819.15
  5. Step 5: Solve for x
    x = 147,559,819.15/13,556.60
  6. Step 6: Final answer
    x = 10,884.72

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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.