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Finding the Fourth Proportional to 1,145.94, 1,718.78 and 512.79

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Solution

The fourth proportional to 1,145.94, 1,718.78 and 512.79 is: 769.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.94 : 1,718.78 = 512.79 : x
  2. Step 2: Convert to fraction form
    1,145.94/1,718.78 = 512.79/x
  3. Step 3: Cross multiply
    1,145.94x = 1,718.78 × 512.79
  4. Step 4: Simplify right side
    1,145.94x = 881,370.63
  5. Step 5: Solve for x
    x = 881,370.63/1,145.94
  6. Step 6: Final answer
    x = 769.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.