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Finding the Fourth Proportional to 79,898.50, 110,218.40 and 64,808.20

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Solution

The fourth proportional to 79,898.50, 110,218.40 and 64,808.20 is: 89,401.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,898.50 : 110,218.40 = 64,808.20 : x
  2. Step 2: Convert to fraction form
    79,898.50/110,218.40 = 64,808.20/x
  3. Step 3: Cross multiply
    79,898.50x = 110,218.40 × 64,808.20
  4. Step 4: Simplify right side
    79,898.50x = 7,143,055,559.79
  5. Step 5: Solve for x
    x = 7,143,055,559.79/79,898.50
  6. Step 6: Final answer
    x = 89,401.63

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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.