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Finding the Fourth Proportional to 865.45, 1,194.31 and 511.38

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Solution

The fourth proportional to 865.45, 1,194.31 and 511.38 is: 705.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.45 : 1,194.31 = 511.38 : x
  2. Step 2: Convert to fraction form
    865.45/1,194.31 = 511.38/x
  3. Step 3: Cross multiply
    865.45x = 1,194.31 × 511.38
  4. Step 4: Simplify right side
    865.45x = 610,746.25
  5. Step 5: Solve for x
    x = 610,746.25/865.45
  6. Step 6: Final answer
    x = 705.70

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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.