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Finding the Fourth Proportional to 70,239.32, 105,359.07 and 28,686.32

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Solution

The fourth proportional to 70,239.32, 105,359.07 and 28,686.32 is: 43,029.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,239.32 : 105,359.07 = 28,686.32 : x
  2. Step 2: Convert to fraction form
    70,239.32/105,359.07 = 28,686.32/x
  3. Step 3: Cross multiply
    70,239.32x = 105,359.07 × 28,686.32
  4. Step 4: Simplify right side
    70,239.32x = 3,022,363,470.13
  5. Step 5: Solve for x
    x = 3,022,363,470.13/70,239.32
  6. Step 6: Final answer
    x = 43,029.51

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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.