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Finding the Fourth Proportional to 2,986.87, 4,478.85 and 906.50

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Solution

The fourth proportional to 2,986.87, 4,478.85 and 906.50 is: 1,359.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,986.87 : 4,478.85 = 906.50 : x
  2. Step 2: Convert to fraction form
    2,986.87/4,478.85 = 906.50/x
  3. Step 3: Cross multiply
    2,986.87x = 4,478.85 × 906.50
  4. Step 4: Simplify right side
    2,986.87x = 4,060,055.13
  5. Step 5: Solve for x
    x = 4,060,055.13/2,986.87
  6. Step 6: Final answer
    x = 1,359.30

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1.5x scale

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.