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Finding the Fourth Proportional to 1,038.21, 1,556.67 and 490.74

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Solution

The fourth proportional to 1,038.21, 1,556.67 and 490.74 is: 735.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.21 : 1,556.67 = 490.74 : x
  2. Step 2: Convert to fraction form
    1,038.21/1,556.67 = 490.74/x
  3. Step 3: Cross multiply
    1,038.21x = 1,556.67 × 490.74
  4. Step 4: Simplify right side
    1,038.21x = 763,920.24
  5. Step 5: Solve for x
    x = 763,920.24/1,038.21
  6. Step 6: Final answer
    x = 735.81

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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.