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Finding the Fourth Proportional to 1,007.97, 1,389.67 and 692.67

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Solution

The fourth proportional to 1,007.97, 1,389.67 and 692.67 is: 954.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.97 : 1,389.67 = 692.67 : x
  2. Step 2: Convert to fraction form
    1,007.97/1,389.67 = 692.67/x
  3. Step 3: Cross multiply
    1,007.97x = 1,389.67 × 692.67
  4. Step 4: Simplify right side
    1,007.97x = 962,582.72
  5. Step 5: Solve for x
    x = 962,582.72/1,007.97
  6. Step 6: Final answer
    x = 954.97

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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.