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Finding the Fourth Proportional to 218,790.72, 328,184.64 and 61,020

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Solution

The fourth proportional to 218,790.72, 328,184.64 and 61,020 is: 91,529.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,790.72 : 328,184.64 = 61,020 : x
  2. Step 2: Convert to fraction form
    218,790.72/328,184.64 = 61,020/x
  3. Step 3: Cross multiply
    218,790.72x = 328,184.64 × 61,020
  4. Step 4: Simplify right side
    218,790.72x = 20,025,826,732.80
  5. Step 5: Solve for x
    x = 20,025,826,732.80/218,790.72
  6. Step 6: Final answer
    x = 91,529.60

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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.