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Finding the Fourth Proportional to 1,006.61, 1,389.09 and 564.50

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Solution

The fourth proportional to 1,006.61, 1,389.09 and 564.50 is: 778.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.61 : 1,389.09 = 564.50 : x
  2. Step 2: Convert to fraction form
    1,006.61/1,389.09 = 564.50/x
  3. Step 3: Cross multiply
    1,006.61x = 1,389.09 × 564.50
  4. Step 4: Simplify right side
    1,006.61x = 784,141.31
  5. Step 5: Solve for x
    x = 784,141.31/1,006.61
  6. Step 6: Final answer
    x = 778.99

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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.