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Finding the Fourth Proportional to 10,668.60, 14,720.40 and 6,689.88

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Solution

The fourth proportional to 10,668.60, 14,720.40 and 6,689.88 is: 9,230.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,668.60 : 14,720.40 = 6,689.88 : x
  2. Step 2: Convert to fraction form
    10,668.60/14,720.40 = 6,689.88/x
  3. Step 3: Cross multiply
    10,668.60x = 14,720.40 × 6,689.88
  4. Step 4: Simplify right side
    10,668.60x = 98,477,709.55
  5. Step 5: Solve for x
    x = 98,477,709.55/10,668.60
  6. Step 6: Final answer
    x = 9,230.61

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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.