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Finding the Fourth Proportional to 328,446.40, 492,799.20 and 128,732.80

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Solution

The fourth proportional to 328,446.40, 492,799.20 and 128,732.80 is: 193,150.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,446.40 : 492,799.20 = 128,732.80 : x
  2. Step 2: Convert to fraction form
    328,446.40/492,799.20 = 128,732.80/x
  3. Step 3: Cross multiply
    328,446.40x = 492,799.20 × 128,732.80
  4. Step 4: Simplify right side
    328,446.40x = 63,439,420,853.76
  5. Step 5: Solve for x
    x = 63,439,420,853.76/328,446.40
  6. Step 6: Final answer
    x = 193,150.00

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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.