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Finding the Fourth Proportional to 1,707.78, 2,356.78 and 999.70

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Solution

The fourth proportional to 1,707.78, 2,356.78 and 999.70 is: 1,379.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,707.78 : 2,356.78 = 999.70 : x
  2. Step 2: Convert to fraction form
    1,707.78/2,356.78 = 999.70/x
  3. Step 3: Cross multiply
    1,707.78x = 2,356.78 × 999.70
  4. Step 4: Simplify right side
    1,707.78x = 2,356,072.97
  5. Step 5: Solve for x
    x = 2,356,072.97/1,707.78
  6. Step 6: Final answer
    x = 1,379.61

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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.