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Finding the Fourth Proportional to 1,006.70, 1,389.30 and 757.57

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Solution

The fourth proportional to 1,006.70, 1,389.30 and 757.57 is: 1,045.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.70 : 1,389.30 = 757.57 : x
  2. Step 2: Convert to fraction form
    1,006.70/1,389.30 = 757.57/x
  3. Step 3: Cross multiply
    1,006.70x = 1,389.30 × 757.57
  4. Step 4: Simplify right side
    1,006.70x = 1,052,488.21
  5. Step 5: Solve for x
    x = 1,052,488.21/1,006.70
  6. Step 6: Final answer
    x = 1,045.49

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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.