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Finding the Fourth Proportional to 710.87, 980.75 and 489.42

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Solution

The fourth proportional to 710.87, 980.75 and 489.42 is: 675.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.87 : 980.75 = 489.42 : x
  2. Step 2: Convert to fraction form
    710.87/980.75 = 489.42/x
  3. Step 3: Cross multiply
    710.87x = 980.75 × 489.42
  4. Step 4: Simplify right side
    710.87x = 479,999.89
  5. Step 5: Solve for x
    x = 479,999.89/710.87
  6. Step 6: Final answer
    x = 675.23

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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.