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Finding the Fourth Proportional to 858.06, 1,287.18 and 280.98

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Solution

The fourth proportional to 858.06, 1,287.18 and 280.98 is: 421.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.06 : 1,287.18 = 280.98 : x
  2. Step 2: Convert to fraction form
    858.06/1,287.18 = 280.98/x
  3. Step 3: Cross multiply
    858.06x = 1,287.18 × 280.98
  4. Step 4: Simplify right side
    858.06x = 361,671.84
  5. Step 5: Solve for x
    x = 361,671.84/858.06
  6. Step 6: Final answer
    x = 421.50

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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.