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Finding the Fourth Proportional to 65,453.70, 90,334.56 and 39,954.72

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Solution

The fourth proportional to 65,453.70, 90,334.56 and 39,954.72 is: 55,142.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,453.70 : 90,334.56 = 39,954.72 : x
  2. Step 2: Convert to fraction form
    65,453.70/90,334.56 = 39,954.72/x
  3. Step 3: Cross multiply
    65,453.70x = 90,334.56 × 39,954.72
  4. Step 4: Simplify right side
    65,453.70x = 3,609,292,051.12
  5. Step 5: Solve for x
    x = 3,609,292,051.12/65,453.70
  6. Step 6: Final answer
    x = 55,142.67

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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.