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Finding the Fourth Proportional to 858.93, 1,185.24 and 485.88

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Solution

The fourth proportional to 858.93, 1,185.24 and 485.88 is: 670.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.93 : 1,185.24 = 485.88 : x
  2. Step 2: Convert to fraction form
    858.93/1,185.24 = 485.88/x
  3. Step 3: Cross multiply
    858.93x = 1,185.24 × 485.88
  4. Step 4: Simplify right side
    858.93x = 575,884.41
  5. Step 5: Solve for x
    x = 575,884.41/858.93
  6. Step 6: Final answer
    x = 670.47

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Double scale
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1.5x scale

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.