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Finding the Fourth Proportional to 7,811.79, 10,780.34 and 4,275.33

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Solution

The fourth proportional to 7,811.79, 10,780.34 and 4,275.33 is: 5,899.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,811.79 : 10,780.34 = 4,275.33 : x
  2. Step 2: Convert to fraction form
    7,811.79/10,780.34 = 4,275.33/x
  3. Step 3: Cross multiply
    7,811.79x = 10,780.34 × 4,275.33
  4. Step 4: Simplify right side
    7,811.79x = 46,089,489.64
  5. Step 5: Solve for x
    x = 46,089,489.64/7,811.79
  6. Step 6: Final answer
    x = 5,899.99

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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.