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Finding the Fourth Proportional to 975.75, 1,345.91 and 680.91

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Solution

The fourth proportional to 975.75, 1,345.91 and 680.91 is: 939.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.75 : 1,345.91 = 680.91 : x
  2. Step 2: Convert to fraction form
    975.75/1,345.91 = 680.91/x
  3. Step 3: Cross multiply
    975.75x = 1,345.91 × 680.91
  4. Step 4: Simplify right side
    975.75x = 916,436.85
  5. Step 5: Solve for x
    x = 916,436.85/975.75
  6. Step 6: Final answer
    x = 939.22

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.