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Finding the Fourth Proportional to 1,179.79, 1,628.10 and 655.81

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Solution

The fourth proportional to 1,179.79, 1,628.10 and 655.81 is: 905.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.79 : 1,628.10 = 655.81 : x
  2. Step 2: Convert to fraction form
    1,179.79/1,628.10 = 655.81/x
  3. Step 3: Cross multiply
    1,179.79x = 1,628.10 × 655.81
  4. Step 4: Simplify right side
    1,179.79x = 1,067,724.26
  5. Step 5: Solve for x
    x = 1,067,724.26/1,179.79
  6. Step 6: Final answer
    x = 905.01

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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.