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Finding the Fourth Proportional to 65,470.60, 90,361.20 and 38,611.54

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Solution

The fourth proportional to 65,470.60, 90,361.20 and 38,611.54 is: 53,290.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,470.60 : 90,361.20 = 38,611.54 : x
  2. Step 2: Convert to fraction form
    65,470.60/90,361.20 = 38,611.54/x
  3. Step 3: Cross multiply
    65,470.60x = 90,361.20 × 38,611.54
  4. Step 4: Simplify right side
    65,470.60x = 3,488,985,088.25
  5. Step 5: Solve for x
    x = 3,488,985,088.25/65,470.60
  6. Step 6: Final answer
    x = 53,290.87

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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.