Home / 3,157.15-4,356.76-1,978.87

Finding the Fourth Proportional to 3,157.15, 4,356.76 and 1,978.87

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Solution

The fourth proportional to 3,157.15, 4,356.76 and 1,978.87 is: 2,730.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,157.15 : 4,356.76 = 1,978.87 : x
  2. Step 2: Convert to fraction form
    3,157.15/4,356.76 = 1,978.87/x
  3. Step 3: Cross multiply
    3,157.15x = 4,356.76 × 1,978.87
  4. Step 4: Simplify right side
    3,157.15x = 8,621,461.66
  5. Step 5: Solve for x
    x = 8,621,461.66/3,157.15
  6. Step 6: Final answer
    x = 2,730.77

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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.