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Finding the Fourth Proportional to 975.44, 1,345.21 and 863.56

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Solution

The fourth proportional to 975.44, 1,345.21 and 863.56 is: 1,190.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.44 : 1,345.21 = 863.56 : x
  2. Step 2: Convert to fraction form
    975.44/1,345.21 = 863.56/x
  3. Step 3: Cross multiply
    975.44x = 1,345.21 × 863.56
  4. Step 4: Simplify right side
    975.44x = 1,161,669.07
  5. Step 5: Solve for x
    x = 1,161,669.07/975.44
  6. Step 6: Final answer
    x = 1,190.91

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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.