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Finding the Fourth Proportional to 921.98, 1,271.45 and 711.82

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Solution

The fourth proportional to 921.98, 1,271.45 and 711.82 is: 981.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.98 : 1,271.45 = 711.82 : x
  2. Step 2: Convert to fraction form
    921.98/1,271.45 = 711.82/x
  3. Step 3: Cross multiply
    921.98x = 1,271.45 × 711.82
  4. Step 4: Simplify right side
    921.98x = 905,043.54
  5. Step 5: Solve for x
    x = 905,043.54/921.98
  6. Step 6: Final answer
    x = 981.63

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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.