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Finding the Fourth Proportional to 78,448.65, 108,260.22 and 42,638.64

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Solution

The fourth proportional to 78,448.65, 108,260.22 and 42,638.64 is: 58,841.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,448.65 : 108,260.22 = 42,638.64 : x
  2. Step 2: Convert to fraction form
    78,448.65/108,260.22 = 42,638.64/x
  3. Step 3: Cross multiply
    78,448.65x = 108,260.22 × 42,638.64
  4. Step 4: Simplify right side
    78,448.65x = 4,616,068,546.90
  5. Step 5: Solve for x
    x = 4,616,068,546.90/78,448.65
  6. Step 6: Final answer
    x = 58,841.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.