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Finding the Fourth Proportional to 1,069.44, 1,603.86 and 678.87

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Solution

The fourth proportional to 1,069.44, 1,603.86 and 678.87 is: 1,018.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.44 : 1,603.86 = 678.87 : x
  2. Step 2: Convert to fraction form
    1,069.44/1,603.86 = 678.87/x
  3. Step 3: Cross multiply
    1,069.44x = 1,603.86 × 678.87
  4. Step 4: Simplify right side
    1,069.44x = 1,088,812.44
  5. Step 5: Solve for x
    x = 1,088,812.44/1,069.44
  6. Step 6: Final answer
    x = 1,018.11

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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.