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Finding the Fourth Proportional to 554.31, 830.61 and 489.15

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Solution

The fourth proportional to 554.31, 830.61 and 489.15 is: 732.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.31 : 830.61 = 489.15 : x
  2. Step 2: Convert to fraction form
    554.31/830.61 = 489.15/x
  3. Step 3: Cross multiply
    554.31x = 830.61 × 489.15
  4. Step 4: Simplify right side
    554.31x = 406,292.88
  5. Step 5: Solve for x
    x = 406,292.88/554.31
  6. Step 6: Final answer
    x = 732.97

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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.