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Finding the Fourth Proportional to 1,603.41, 2,405.09 and 678.50

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Solution

The fourth proportional to 1,603.41, 2,405.09 and 678.50 is: 1,017.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,603.41 : 2,405.09 = 678.50 : x
  2. Step 2: Convert to fraction form
    1,603.41/2,405.09 = 678.50/x
  3. Step 3: Cross multiply
    1,603.41x = 2,405.09 × 678.50
  4. Step 4: Simplify right side
    1,603.41x = 1,631,838.15
  5. Step 5: Solve for x
    x = 1,631,838.15/1,603.41
  6. Step 6: Final answer
    x = 1,017.73

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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.