Home / 78,115.03-107,718.10-66,821.91

Finding the Fourth Proportional to 78,115.03, 107,718.10 and 66,821.91

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Solution

The fourth proportional to 78,115.03, 107,718.10 and 66,821.91 is: 92,145.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,115.03 : 107,718.10 = 66,821.91 : x
  2. Step 2: Convert to fraction form
    78,115.03/107,718.10 = 66,821.91/x
  3. Step 3: Cross multiply
    78,115.03x = 107,718.10 × 66,821.91
  4. Step 4: Simplify right side
    78,115.03x = 7,197,929,594.36
  5. Step 5: Solve for x
    x = 7,197,929,594.36/78,115.03
  6. Step 6: Final answer
    x = 92,145.25

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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.