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Finding the Fourth Proportional to 70,379.60, 105,479.16 and 28,777.04

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Solution

The fourth proportional to 70,379.60, 105,479.16 and 28,777.04 is: 43,128.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,379.60 : 105,479.16 = 28,777.04 : x
  2. Step 2: Convert to fraction form
    70,379.60/105,479.16 = 28,777.04/x
  3. Step 3: Cross multiply
    70,379.60x = 105,479.16 × 28,777.04
  4. Step 4: Simplify right side
    70,379.60x = 3,035,378,006.49
  5. Step 5: Solve for x
    x = 3,035,378,006.49/70,379.60
  6. Step 6: Final answer
    x = 43,128.66

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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.