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Finding the Fourth Proportional to 1,006.91, 1,389.54 and 564.81

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Solution

The fourth proportional to 1,006.91, 1,389.54 and 564.81 is: 779.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.91 : 1,389.54 = 564.81 : x
  2. Step 2: Convert to fraction form
    1,006.91/1,389.54 = 564.81/x
  3. Step 3: Cross multiply
    1,006.91x = 1,389.54 × 564.81
  4. Step 4: Simplify right side
    1,006.91x = 784,823.97
  5. Step 5: Solve for x
    x = 784,823.97/1,006.91
  6. Step 6: Final answer
    x = 779.44

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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.