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Finding the Fourth Proportional to 1,999.42, 2,999.33 and 612.74

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Solution

The fourth proportional to 1,999.42, 2,999.33 and 612.74 is: 919.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.42 : 2,999.33 = 612.74 : x
  2. Step 2: Convert to fraction form
    1,999.42/2,999.33 = 612.74/x
  3. Step 3: Cross multiply
    1,999.42x = 2,999.33 × 612.74
  4. Step 4: Simplify right side
    1,999.42x = 1,837,809.46
  5. Step 5: Solve for x
    x = 1,837,809.46/1,999.42
  6. Step 6: Final answer
    x = 919.17

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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.