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Finding the Fourth Proportional to 1,991, 2,985.52 and 604.08

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Solution

The fourth proportional to 1,991, 2,985.52 and 604.08 is: 905.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991 : 2,985.52 = 604.08 : x
  2. Step 2: Convert to fraction form
    1,991/2,985.52 = 604.08/x
  3. Step 3: Cross multiply
    1,991x = 2,985.52 × 604.08
  4. Step 4: Simplify right side
    1,991x = 1,803,492.92
  5. Step 5: Solve for x
    x = 1,803,492.92/1,991
  6. Step 6: Final answer
    x = 905.82

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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.