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Finding the Fourth Proportional to 81,647.80, 122,298.90 and 81,647.80

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Solution

The fourth proportional to 81,647.80, 122,298.90 and 81,647.80 is: 122,298.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,647.80 : 122,298.90 = 81,647.80 : x
  2. Step 2: Convert to fraction form
    81,647.80/122,298.90 = 81,647.80/x
  3. Step 3: Cross multiply
    81,647.80x = 122,298.90 × 81,647.80
  4. Step 4: Simplify right side
    81,647.80x = 9,985,436,127.42
  5. Step 5: Solve for x
    x = 9,985,436,127.42/81,647.80
  6. Step 6: Final answer
    x = 122,298.90

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1.5x scale

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.