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Finding the Fourth Proportional to 865.47, 1,194.75 and 511.28

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Solution

The fourth proportional to 865.47, 1,194.75 and 511.28 is: 705.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.47 : 1,194.75 = 511.28 : x
  2. Step 2: Convert to fraction form
    865.47/1,194.75 = 511.28/x
  3. Step 3: Cross multiply
    865.47x = 1,194.75 × 511.28
  4. Step 4: Simplify right side
    865.47x = 610,851.78
  5. Step 5: Solve for x
    x = 610,851.78/865.47
  6. Step 6: Final answer
    x = 705.80

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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.