Home / 4,985.92-6,880.80-2,891.20

Finding the Fourth Proportional to 4,985.92, 6,880.80 and 2,891.20

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Solution

The fourth proportional to 4,985.92, 6,880.80 and 2,891.20 is: 3,989.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,985.92 : 6,880.80 = 2,891.20 : x
  2. Step 2: Convert to fraction form
    4,985.92/6,880.80 = 2,891.20/x
  3. Step 3: Cross multiply
    4,985.92x = 6,880.80 × 2,891.20
  4. Step 4: Simplify right side
    4,985.92x = 19,893,768.96
  5. Step 5: Solve for x
    x = 19,893,768.96/4,985.92
  6. Step 6: Final answer
    x = 3,989.99

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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.