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Finding the Fourth Proportional to 879,172, 1,318,863.78 and 310,436.08

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Solution

The fourth proportional to 879,172, 1,318,863.78 and 310,436.08 is: 465,691.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,172 : 1,318,863.78 = 310,436.08 : x
  2. Step 2: Convert to fraction form
    879,172/1,318,863.78 = 310,436.08/x
  3. Step 3: Cross multiply
    879,172x = 1,318,863.78 × 310,436.08
  4. Step 4: Simplify right side
    879,172x = 409,422,901,917.18
  5. Step 5: Solve for x
    x = 409,422,901,917.18/879,172
  6. Step 6: Final answer
    x = 465,691.47

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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.