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Finding the Fourth Proportional to 2,379.86, 3,569.06 and 840.50

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Solution

The fourth proportional to 2,379.86, 3,569.06 and 840.50 is: 1,260.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,379.86 : 3,569.06 = 840.50 : x
  2. Step 2: Convert to fraction form
    2,379.86/3,569.06 = 840.50/x
  3. Step 3: Cross multiply
    2,379.86x = 3,569.06 × 840.50
  4. Step 4: Simplify right side
    2,379.86x = 2,999,794.93
  5. Step 5: Solve for x
    x = 2,999,794.93/2,379.86
  6. Step 6: Final answer
    x = 1,260.49

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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.