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Finding the Fourth Proportional to 70,640.32, 105,861.96 and 53,089.60

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Solution

The fourth proportional to 70,640.32, 105,861.96 and 53,089.60 is: 79,560.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,640.32 : 105,861.96 = 53,089.60 : x
  2. Step 2: Convert to fraction form
    70,640.32/105,861.96 = 53,089.60/x
  3. Step 3: Cross multiply
    70,640.32x = 105,861.96 × 53,089.60
  4. Step 4: Simplify right side
    70,640.32x = 5,620,169,111.62
  5. Step 5: Solve for x
    x = 5,620,169,111.62/70,640.32
  6. Step 6: Final answer
    x = 79,560.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.