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Finding the Fourth Proportional to 218,998.80, 328,421.40 and 113,782.80

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Solution

The fourth proportional to 218,998.80, 328,421.40 and 113,782.80 is: 170,634.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,998.80 : 328,421.40 = 113,782.80 : x
  2. Step 2: Convert to fraction form
    218,998.80/328,421.40 = 113,782.80/x
  3. Step 3: Cross multiply
    218,998.80x = 328,421.40 × 113,782.80
  4. Step 4: Simplify right side
    218,998.80x = 37,368,706,471.92
  5. Step 5: Solve for x
    x = 37,368,706,471.92/218,998.80
  6. Step 6: Final answer
    x = 170,634.30

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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.