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Finding the Fourth Proportional to 1,037.21, 1,556.69 and 489.78

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Solution

The fourth proportional to 1,037.21, 1,556.69 and 489.78 is: 735.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,037.21 : 1,556.69 = 489.78 : x
  2. Step 2: Convert to fraction form
    1,037.21/1,556.69 = 489.78/x
  3. Step 3: Cross multiply
    1,037.21x = 1,556.69 × 489.78
  4. Step 4: Simplify right side
    1,037.21x = 762,433.18
  5. Step 5: Solve for x
    x = 762,433.18/1,037.21
  6. Step 6: Final answer
    x = 735.08

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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.