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Finding the Fourth Proportional to 644.58, 970.34 and 550.62

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Solution

The fourth proportional to 644.58, 970.34 and 550.62 is: 828.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.58 : 970.34 = 550.62 : x
  2. Step 2: Convert to fraction form
    644.58/970.34 = 550.62/x
  3. Step 3: Cross multiply
    644.58x = 970.34 × 550.62
  4. Step 4: Simplify right side
    644.58x = 534,285.86
  5. Step 5: Solve for x
    x = 534,285.86/644.58
  6. Step 6: Final answer
    x = 828.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.