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Finding the Fourth Proportional to 1,006.40, 1,389.60 and 697.28

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Solution

The fourth proportional to 1,006.40, 1,389.60 and 697.28 is: 962.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.40 : 1,389.60 = 697.28 : x
  2. Step 2: Convert to fraction form
    1,006.40/1,389.60 = 697.28/x
  3. Step 3: Cross multiply
    1,006.40x = 1,389.60 × 697.28
  4. Step 4: Simplify right side
    1,006.40x = 968,940.29
  5. Step 5: Solve for x
    x = 968,940.29/1,006.40
  6. Step 6: Final answer
    x = 962.78

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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.