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Finding the Fourth Proportional to 2,999.90, 4,499.65 and 919.72

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Solution

The fourth proportional to 2,999.90, 4,499.65 and 919.72 is: 1,379.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,999.90 : 4,499.65 = 919.72 : x
  2. Step 2: Convert to fraction form
    2,999.90/4,499.65 = 919.72/x
  3. Step 3: Cross multiply
    2,999.90x = 4,499.65 × 919.72
  4. Step 4: Simplify right side
    2,999.90x = 4,138,418.10
  5. Step 5: Solve for x
    x = 4,138,418.10/2,999.90
  6. Step 6: Final answer
    x = 1,379.52

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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.