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Finding the Fourth Proportional to 858.41, 1,288.03 and 310.45

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Solution

The fourth proportional to 858.41, 1,288.03 and 310.45 is: 465.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.41 : 1,288.03 = 310.45 : x
  2. Step 2: Convert to fraction form
    858.41/1,288.03 = 310.45/x
  3. Step 3: Cross multiply
    858.41x = 1,288.03 × 310.45
  4. Step 4: Simplify right side
    858.41x = 399,867.04
  5. Step 5: Solve for x
    x = 399,867.04/858.41
  6. Step 6: Final answer
    x = 465.82

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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.