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Finding the Fourth Proportional to 1,386.69, 2,078.24 and 564

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Solution

The fourth proportional to 1,386.69, 2,078.24 and 564 is: 845.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.69 : 2,078.24 = 564 : x
  2. Step 2: Convert to fraction form
    1,386.69/2,078.24 = 564/x
  3. Step 3: Cross multiply
    1,386.69x = 2,078.24 × 564
  4. Step 4: Simplify right side
    1,386.69x = 1,172,127.36
  5. Step 5: Solve for x
    x = 1,172,127.36/1,386.69
  6. Step 6: Final answer
    x = 845.27

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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.