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Finding the Fourth Proportional to 1,063.85, 1,467.90 and 621.78

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Solution

The fourth proportional to 1,063.85, 1,467.90 and 621.78 is: 857.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,063.85 : 1,467.90 = 621.78 : x
  2. Step 2: Convert to fraction form
    1,063.85/1,467.90 = 621.78/x
  3. Step 3: Cross multiply
    1,063.85x = 1,467.90 × 621.78
  4. Step 4: Simplify right side
    1,063.85x = 912,710.86
  5. Step 5: Solve for x
    x = 912,710.86/1,063.85
  6. Step 6: Final answer
    x = 857.94

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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.