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Finding the Fourth Proportional to 1,009.79, 1,392.01 and 694.56

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Solution

The fourth proportional to 1,009.79, 1,392.01 and 694.56 is: 957.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.79 : 1,392.01 = 694.56 : x
  2. Step 2: Convert to fraction form
    1,009.79/1,392.01 = 694.56/x
  3. Step 3: Cross multiply
    1,009.79x = 1,392.01 × 694.56
  4. Step 4: Simplify right side
    1,009.79x = 966,834.47
  5. Step 5: Solve for x
    x = 966,834.47/1,009.79
  6. Step 6: Final answer
    x = 957.46

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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.