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Finding the Fourth Proportional to 855.07, 1,281.75 and 489.10

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Solution

The fourth proportional to 855.07, 1,281.75 and 489.10 is: 733.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.07 : 1,281.75 = 489.10 : x
  2. Step 2: Convert to fraction form
    855.07/1,281.75 = 489.10/x
  3. Step 3: Cross multiply
    855.07x = 1,281.75 × 489.10
  4. Step 4: Simplify right side
    855.07x = 626,903.93
  5. Step 5: Solve for x
    x = 626,903.93/855.07
  6. Step 6: Final answer
    x = 733.16

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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.