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Finding the Fourth Proportional to 328,519.30, 492,703.60 and 91,878.70

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Solution

The fourth proportional to 328,519.30, 492,703.60 and 91,878.70 is: 137,796.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,519.30 : 492,703.60 = 91,878.70 : x
  2. Step 2: Convert to fraction form
    328,519.30/492,703.60 = 91,878.70/x
  3. Step 3: Cross multiply
    328,519.30x = 492,703.60 × 91,878.70
  4. Step 4: Simplify right side
    328,519.30x = 45,268,966,253.32
  5. Step 5: Solve for x
    x = 45,268,966,253.32/328,519.30
  6. Step 6: Final answer
    x = 137,796.98

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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.