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Finding the Fourth Proportional to 1,485.64, 2,049.80 and 847.42

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Solution

The fourth proportional to 1,485.64, 2,049.80 and 847.42 is: 1,169.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.64 : 2,049.80 = 847.42 : x
  2. Step 2: Convert to fraction form
    1,485.64/2,049.80 = 847.42/x
  3. Step 3: Cross multiply
    1,485.64x = 2,049.80 × 847.42
  4. Step 4: Simplify right side
    1,485.64x = 1,737,041.52
  5. Step 5: Solve for x
    x = 1,737,041.52/1,485.64
  6. Step 6: Final answer
    x = 1,169.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.