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Finding the Fourth Proportional to 328,288.60, 492,087.30 and 128,531.80

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Solution

The fourth proportional to 328,288.60, 492,087.30 and 128,531.80 is: 192,662.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,288.60 : 492,087.30 = 128,531.80 : x
  2. Step 2: Convert to fraction form
    328,288.60/492,087.30 = 128,531.80/x
  3. Step 3: Cross multiply
    328,288.60x = 492,087.30 × 128,531.80
  4. Step 4: Simplify right side
    328,288.60x = 63,248,866,426.14
  5. Step 5: Solve for x
    x = 63,248,866,426.14/328,288.60
  6. Step 6: Final answer
    x = 192,662.39

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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.