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Finding the Fourth Proportional to 1,392.36, 2,089.49 and 570.78

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Solution

The fourth proportional to 1,392.36, 2,089.49 and 570.78 is: 856.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.36 : 2,089.49 = 570.78 : x
  2. Step 2: Convert to fraction form
    1,392.36/2,089.49 = 570.78/x
  3. Step 3: Cross multiply
    1,392.36x = 2,089.49 × 570.78
  4. Step 4: Simplify right side
    1,392.36x = 1,192,636.25
  5. Step 5: Solve for x
    x = 1,192,636.25/1,392.36
  6. Step 6: Final answer
    x = 856.56

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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.