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Finding the Fourth Proportional to 70,292.61, 105,439.32 and 28,739.61

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Solution

The fourth proportional to 70,292.61, 105,439.32 and 28,739.61 is: 43,109.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,292.61 : 105,439.32 = 28,739.61 : x
  2. Step 2: Convert to fraction form
    70,292.61/105,439.32 = 28,739.61/x
  3. Step 3: Cross multiply
    70,292.61x = 105,439.32 × 28,739.61
  4. Step 4: Simplify right side
    70,292.61x = 3,030,284,935.47
  5. Step 5: Solve for x
    x = 3,030,284,935.47/70,292.61
  6. Step 6: Final answer
    x = 43,109.58

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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.