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Finding the Fourth Proportional to 927.62, 1,277.91 and 647.36

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Solution

The fourth proportional to 927.62, 1,277.91 and 647.36 is: 891.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.62 : 1,277.91 = 647.36 : x
  2. Step 2: Convert to fraction form
    927.62/1,277.91 = 647.36/x
  3. Step 3: Cross multiply
    927.62x = 1,277.91 × 647.36
  4. Step 4: Simplify right side
    927.62x = 827,266.22
  5. Step 5: Solve for x
    x = 827,266.22/927.62
  6. Step 6: Final answer
    x = 891.82

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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.