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Finding the Fourth Proportional to 7,051.76, 9,731.76 and 3,908

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Solution

The fourth proportional to 7,051.76, 9,731.76 and 3,908 is: 5,393.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,051.76 : 9,731.76 = 3,908 : x
  2. Step 2: Convert to fraction form
    7,051.76/9,731.76 = 3,908/x
  3. Step 3: Cross multiply
    7,051.76x = 9,731.76 × 3,908
  4. Step 4: Simplify right side
    7,051.76x = 38,031,718.08
  5. Step 5: Solve for x
    x = 38,031,718.08/7,051.76
  6. Step 6: Final answer
    x = 5,393.22

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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.