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Finding the Fourth Proportional to 4,985.80, 6,880.12 and 2,860.88

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Solution

The fourth proportional to 4,985.80, 6,880.12 and 2,860.88 is: 3,947.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,985.80 : 6,880.12 = 2,860.88 : x
  2. Step 2: Convert to fraction form
    4,985.80/6,880.12 = 2,860.88/x
  3. Step 3: Cross multiply
    4,985.80x = 6,880.12 × 2,860.88
  4. Step 4: Simplify right side
    4,985.80x = 19,683,197.71
  5. Step 5: Solve for x
    x = 19,683,197.71/4,985.80
  6. Step 6: Final answer
    x = 3,947.85

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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.