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Finding the Fourth Proportional to 921, 1,271.70 and 611.16

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Solution

The fourth proportional to 921, 1,271.70 and 611.16 is: 843.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    921 : 1,271.70 = 611.16 : x
  2. Step 2: Convert to fraction form
    921/1,271.70 = 611.16/x
  3. Step 3: Cross multiply
    921x = 1,271.70 × 611.16
  4. Step 4: Simplify right side
    921x = 777,212.17
  5. Step 5: Solve for x
    x = 777,212.17/921
  6. Step 6: Final answer
    x = 843.88

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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.