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Finding the Fourth Proportional to 1,108.45, 1,661.85 and 483.63

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Solution

The fourth proportional to 1,108.45, 1,661.85 and 483.63 is: 725.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.45 : 1,661.85 = 483.63 : x
  2. Step 2: Convert to fraction form
    1,108.45/1,661.85 = 483.63/x
  3. Step 3: Cross multiply
    1,108.45x = 1,661.85 × 483.63
  4. Step 4: Simplify right side
    1,108.45x = 803,709.79
  5. Step 5: Solve for x
    x = 803,709.79/1,108.45
  6. Step 6: Final answer
    x = 725.08

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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.