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Finding the Fourth Proportional to 3,137.76, 4,707.72 and 1,407.60

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Solution

The fourth proportional to 3,137.76, 4,707.72 and 1,407.60 is: 2,111.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,137.76 : 4,707.72 = 1,407.60 : x
  2. Step 2: Convert to fraction form
    3,137.76/4,707.72 = 1,407.60/x
  3. Step 3: Cross multiply
    3,137.76x = 4,707.72 × 1,407.60
  4. Step 4: Simplify right side
    3,137.76x = 6,626,586.67
  5. Step 5: Solve for x
    x = 6,626,586.67/3,137.76
  6. Step 6: Final answer
    x = 2,111.88

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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.