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Finding the Fourth Proportional to 328,544.40, 492,816.60 and 128,871.30

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Solution

The fourth proportional to 328,544.40, 492,816.60 and 128,871.30 is: 193,306.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,544.40 : 492,816.60 = 128,871.30 : x
  2. Step 2: Convert to fraction form
    328,544.40/492,816.60 = 128,871.30/x
  3. Step 3: Cross multiply
    328,544.40x = 492,816.60 × 128,871.30
  4. Step 4: Simplify right side
    328,544.40x = 63,509,915,903.58
  5. Step 5: Solve for x
    x = 63,509,915,903.58/328,544.40
  6. Step 6: Final answer
    x = 193,306.95

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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.