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Finding the Fourth Proportional to 328,557.75, 492,836.64 and 128,972.13

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Solution

The fourth proportional to 328,557.75, 492,836.64 and 128,972.13 is: 193,458.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,557.75 : 492,836.64 = 128,972.13 : x
  2. Step 2: Convert to fraction form
    328,557.75/492,836.64 = 128,972.13/x
  3. Step 3: Cross multiply
    328,557.75x = 492,836.64 × 128,972.13
  4. Step 4: Simplify right side
    328,557.75x = 63,562,191,202.84
  5. Step 5: Solve for x
    x = 63,562,191,202.84/328,557.75
  6. Step 6: Final answer
    x = 193,458.20

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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.