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Finding the Fourth Proportional to 840.28, 1,260.66 and 511.48

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Solution

The fourth proportional to 840.28, 1,260.66 and 511.48 is: 767.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.28 : 1,260.66 = 511.48 : x
  2. Step 2: Convert to fraction form
    840.28/1,260.66 = 511.48/x
  3. Step 3: Cross multiply
    840.28x = 1,260.66 × 511.48
  4. Step 4: Simplify right side
    840.28x = 644,802.38
  5. Step 5: Solve for x
    x = 644,802.38/840.28
  6. Step 6: Final answer
    x = 767.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.