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Finding the Fourth Proportional to 79,782.78, 109,998 and 65,389.62

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Solution

The fourth proportional to 79,782.78, 109,998 and 65,389.62 is: 90,153.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,782.78 : 109,998 = 65,389.62 : x
  2. Step 2: Convert to fraction form
    79,782.78/109,998 = 65,389.62/x
  3. Step 3: Cross multiply
    79,782.78x = 109,998 × 65,389.62
  4. Step 4: Simplify right side
    79,782.78x = 7,192,727,420.76
  5. Step 5: Solve for x
    x = 7,192,727,420.76/79,782.78
  6. Step 6: Final answer
    x = 90,153.88

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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.