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Finding the Fourth Proportional to 1,999.32, 2,999.36 and 612.50

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Solution

The fourth proportional to 1,999.32, 2,999.36 and 612.50 is: 918.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.32 : 2,999.36 = 612.50 : x
  2. Step 2: Convert to fraction form
    1,999.32/2,999.36 = 612.50/x
  3. Step 3: Cross multiply
    1,999.32x = 2,999.36 × 612.50
  4. Step 4: Simplify right side
    1,999.32x = 1,837,108
  5. Step 5: Solve for x
    x = 1,837,108/1,999.32
  6. Step 6: Final answer
    x = 918.87

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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.