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Finding the Fourth Proportional to 53,239.74, 79,915 and 39,215.60

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Solution

The fourth proportional to 53,239.74, 79,915 and 39,215.60 is: 58,864.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,239.74 : 79,915 = 39,215.60 : x
  2. Step 2: Convert to fraction form
    53,239.74/79,915 = 39,215.60/x
  3. Step 3: Cross multiply
    53,239.74x = 79,915 × 39,215.60
  4. Step 4: Simplify right side
    53,239.74x = 3,133,914,674
  5. Step 5: Solve for x
    x = 3,133,914,674/53,239.74
  6. Step 6: Final answer
    x = 58,864.20

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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.