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Finding the Fourth Proportional to 788.37, 1,087.76 and 489.48

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Solution

The fourth proportional to 788.37, 1,087.76 and 489.48 is: 675.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.37 : 1,087.76 = 489.48 : x
  2. Step 2: Convert to fraction form
    788.37/1,087.76 = 489.48/x
  3. Step 3: Cross multiply
    788.37x = 1,087.76 × 489.48
  4. Step 4: Simplify right side
    788.37x = 532,434.32
  5. Step 5: Solve for x
    x = 532,434.32/788.37
  6. Step 6: Final answer
    x = 675.36

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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.