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Finding the Fourth Proportional to 1,006.19, 1,389.35 and 674.90

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Solution

The fourth proportional to 1,006.19, 1,389.35 and 674.90 is: 931.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.19 : 1,389.35 = 674.90 : x
  2. Step 2: Convert to fraction form
    1,006.19/1,389.35 = 674.90/x
  3. Step 3: Cross multiply
    1,006.19x = 1,389.35 × 674.90
  4. Step 4: Simplify right side
    1,006.19x = 937,668.94
  5. Step 5: Solve for x
    x = 937,668.94/1,006.19
  6. Step 6: Final answer
    x = 931.90

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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.