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Finding the Fourth Proportional to 65,440.70, 90,306.87 and 38,584.34

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Solution

The fourth proportional to 65,440.70, 90,306.87 and 38,584.34 is: 53,245.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,440.70 : 90,306.87 = 38,584.34 : x
  2. Step 2: Convert to fraction form
    65,440.70/90,306.87 = 38,584.34/x
  3. Step 3: Cross multiply
    65,440.70x = 90,306.87 × 38,584.34
  4. Step 4: Simplify right side
    65,440.70x = 3,484,430,976.42
  5. Step 5: Solve for x
    x = 3,484,430,976.42/65,440.70
  6. Step 6: Final answer
    x = 53,245.63

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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.