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Finding the Fourth Proportional to 65,668.56, 90,629.28 and 38,819.76

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Solution

The fourth proportional to 65,668.56, 90,629.28 and 38,819.76 is: 53,575.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,668.56 : 90,629.28 = 38,819.76 : x
  2. Step 2: Convert to fraction form
    65,668.56/90,629.28 = 38,819.76/x
  3. Step 3: Cross multiply
    65,668.56x = 90,629.28 × 38,819.76
  4. Step 4: Simplify right side
    65,668.56x = 3,518,206,898.57
  5. Step 5: Solve for x
    x = 3,518,206,898.57/65,668.56
  6. Step 6: Final answer
    x = 53,575.21

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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.