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Finding the Fourth Proportional to 858.58, 1,184.83 and 485.68

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Solution

The fourth proportional to 858.58, 1,184.83 and 485.68 is: 670.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.58 : 1,184.83 = 485.68 : x
  2. Step 2: Convert to fraction form
    858.58/1,184.83 = 485.68/x
  3. Step 3: Cross multiply
    858.58x = 1,184.83 × 485.68
  4. Step 4: Simplify right side
    858.58x = 575,448.23
  5. Step 5: Solve for x
    x = 575,448.23/858.58
  6. Step 6: Final answer
    x = 670.23

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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.