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Finding the Fourth Proportional to 1,143.81, 1,579.00 and 766.35

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Solution

The fourth proportional to 1,143.81, 1,579.00 and 766.35 is: 1,057.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.81 : 1,579.00 = 766.35 : x
  2. Step 2: Convert to fraction form
    1,143.81/1,579.00 = 766.35/x
  3. Step 3: Cross multiply
    1,143.81x = 1,579.00 × 766.35
  4. Step 4: Simplify right side
    1,143.81x = 1,210,054.92
  5. Step 5: Solve for x
    x = 1,210,054.92/1,143.81
  6. Step 6: Final answer
    x = 1,057.92

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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.