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Finding the Fourth Proportional to 3,118.78, 4,303.86 and 1,721.50

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Solution

The fourth proportional to 3,118.78, 4,303.86 and 1,721.50 is: 2,375.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,118.78 : 4,303.86 = 1,721.50 : x
  2. Step 2: Convert to fraction form
    3,118.78/4,303.86 = 1,721.50/x
  3. Step 3: Cross multiply
    3,118.78x = 4,303.86 × 1,721.50
  4. Step 4: Simplify right side
    3,118.78x = 7,409,094.99
  5. Step 5: Solve for x
    x = 7,409,094.99/3,118.78
  6. Step 6: Final answer
    x = 2,375.64

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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.