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Finding the Fourth Proportional to 619.50, 929.96 and 489.58

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Solution

The fourth proportional to 619.50, 929.96 and 489.58 is: 734.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.50 : 929.96 = 489.58 : x
  2. Step 2: Convert to fraction form
    619.50/929.96 = 489.58/x
  3. Step 3: Cross multiply
    619.50x = 929.96 × 489.58
  4. Step 4: Simplify right side
    619.50x = 455,289.82
  5. Step 5: Solve for x
    x = 455,289.82/619.50
  6. Step 6: Final answer
    x = 734.93

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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.