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Finding the Fourth Proportional to 1,006.35, 1,388.78 and 564.30

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Solution

The fourth proportional to 1,006.35, 1,388.78 and 564.30 is: 778.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.35 : 1,388.78 = 564.30 : x
  2. Step 2: Convert to fraction form
    1,006.35/1,388.78 = 564.30/x
  3. Step 3: Cross multiply
    1,006.35x = 1,388.78 × 564.30
  4. Step 4: Simplify right side
    1,006.35x = 783,685.73
  5. Step 5: Solve for x
    x = 783,685.73/1,006.35
  6. Step 6: Final answer
    x = 778.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.