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Finding the Fourth Proportional to 520.26, 719.19 and 489.66

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Solution

The fourth proportional to 520.26, 719.19 and 489.66 is: 676.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.26 : 719.19 = 489.66 : x
  2. Step 2: Convert to fraction form
    520.26/719.19 = 489.66/x
  3. Step 3: Cross multiply
    520.26x = 719.19 × 489.66
  4. Step 4: Simplify right side
    520.26x = 352,158.58
  5. Step 5: Solve for x
    x = 352,158.58/520.26
  6. Step 6: Final answer
    x = 676.89

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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.