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Finding the Fourth Proportional to 6,415.79, 8,858.79 and 4,921.34

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Solution

The fourth proportional to 6,415.79, 8,858.79 and 4,921.34 is: 6,795.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,415.79 : 8,858.79 = 4,921.34 : x
  2. Step 2: Convert to fraction form
    6,415.79/8,858.79 = 4,921.34/x
  3. Step 3: Cross multiply
    6,415.79x = 8,858.79 × 4,921.34
  4. Step 4: Simplify right side
    6,415.79x = 43,597,073.28
  5. Step 5: Solve for x
    x = 43,597,073.28/6,415.79
  6. Step 6: Final answer
    x = 6,795.28

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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.