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Finding the Fourth Proportional to 7,911.88, 10,917.96 and 4,728.79

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Solution

The fourth proportional to 7,911.88, 10,917.96 and 4,728.79 is: 6,525.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,911.88 : 10,917.96 = 4,728.79 : x
  2. Step 2: Convert to fraction form
    7,911.88/10,917.96 = 4,728.79/x
  3. Step 3: Cross multiply
    7,911.88x = 10,917.96 × 4,728.79
  4. Step 4: Simplify right side
    7,911.88x = 51,628,740.07
  5. Step 5: Solve for x
    x = 51,628,740.07/7,911.88
  6. Step 6: Final answer
    x = 6,525.47

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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.