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Finding the Fourth Proportional to 1,999.61, 2,999.20 and 538.91

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Solution

The fourth proportional to 1,999.61, 2,999.20 and 538.91 is: 808.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.61 : 2,999.20 = 538.91 : x
  2. Step 2: Convert to fraction form
    1,999.61/2,999.20 = 538.91/x
  3. Step 3: Cross multiply
    1,999.61x = 2,999.20 × 538.91
  4. Step 4: Simplify right side
    1,999.61x = 1,616,298.87
  5. Step 5: Solve for x
    x = 1,616,298.87/1,999.61
  6. Step 6: Final answer
    x = 808.31

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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.