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Finding the Fourth Proportional to 3,118.76, 4,303.88 and 1,721.50

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Solution

The fourth proportional to 3,118.76, 4,303.88 and 1,721.50 is: 2,375.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,118.76 : 4,303.88 = 1,721.50 : x
  2. Step 2: Convert to fraction form
    3,118.76/4,303.88 = 1,721.50/x
  3. Step 3: Cross multiply
    3,118.76x = 4,303.88 × 1,721.50
  4. Step 4: Simplify right side
    3,118.76x = 7,409,129.42
  5. Step 5: Solve for x
    x = 7,409,129.42/3,118.76
  6. Step 6: Final answer
    x = 2,375.67

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1.5x scale

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.