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Finding the Fourth Proportional to 7,911.51, 10,916.80 and 6,721.30

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Solution

The fourth proportional to 7,911.51, 10,916.80 and 6,721.30 is: 9,274.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,911.51 : 10,916.80 = 6,721.30 : x
  2. Step 2: Convert to fraction form
    7,911.51/10,916.80 = 6,721.30/x
  3. Step 3: Cross multiply
    7,911.51x = 10,916.80 × 6,721.30
  4. Step 4: Simplify right side
    7,911.51x = 73,375,087.84
  5. Step 5: Solve for x
    x = 73,375,087.84/7,911.51
  6. Step 6: Final answer
    x = 9,274.47

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1.5x scale

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.