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Finding the Fourth Proportional to 858.53, 1,185.10 and 672.08

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Solution

The fourth proportional to 858.53, 1,185.10 and 672.08 is: 927.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.53 : 1,185.10 = 672.08 : x
  2. Step 2: Convert to fraction form
    858.53/1,185.10 = 672.08/x
  3. Step 3: Cross multiply
    858.53x = 1,185.10 × 672.08
  4. Step 4: Simplify right side
    858.53x = 796,481.07
  5. Step 5: Solve for x
    x = 796,481.07/858.53
  6. Step 6: Final answer
    x = 927.72

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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.