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Finding the Fourth Proportional to 1,989.80, 2,985.24 and 603.08

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Solution

The fourth proportional to 1,989.80, 2,985.24 and 603.08 is: 904.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.80 : 2,985.24 = 603.08 : x
  2. Step 2: Convert to fraction form
    1,989.80/2,985.24 = 603.08/x
  3. Step 3: Cross multiply
    1,989.80x = 2,985.24 × 603.08
  4. Step 4: Simplify right side
    1,989.80x = 1,800,338.54
  5. Step 5: Solve for x
    x = 1,800,338.54/1,989.80
  6. Step 6: Final answer
    x = 904.78

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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.