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Finding the Fourth Proportional to 388,411.98, 582,758.28 and 135,729.78

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Solution

The fourth proportional to 388,411.98, 582,758.28 and 135,729.78 is: 203,643.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,411.98 : 582,758.28 = 135,729.78 : x
  2. Step 2: Convert to fraction form
    388,411.98/582,758.28 = 135,729.78/x
  3. Step 3: Cross multiply
    388,411.98x = 582,758.28 × 135,729.78
  4. Step 4: Simplify right side
    388,411.98x = 79,097,653,137.58
  5. Step 5: Solve for x
    x = 79,097,653,137.58/388,411.98
  6. Step 6: Final answer
    x = 203,643.70

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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.