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Finding the Fourth Proportional to 1,007.68, 1,389.14 and 676

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Solution

The fourth proportional to 1,007.68, 1,389.14 and 676 is: 931.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.68 : 1,389.14 = 676 : x
  2. Step 2: Convert to fraction form
    1,007.68/1,389.14 = 676/x
  3. Step 3: Cross multiply
    1,007.68x = 1,389.14 × 676
  4. Step 4: Simplify right side
    1,007.68x = 939,058.64
  5. Step 5: Solve for x
    x = 939,058.64/1,007.68
  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.