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Finding the Fourth Proportional to 2,415.15, 3,622.65 and 771.66

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Solution

The fourth proportional to 2,415.15, 3,622.65 and 771.66 is: 1,157.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,415.15 : 3,622.65 = 771.66 : x
  2. Step 2: Convert to fraction form
    2,415.15/3,622.65 = 771.66/x
  3. Step 3: Cross multiply
    2,415.15x = 3,622.65 × 771.66
  4. Step 4: Simplify right side
    2,415.15x = 2,795,454.10
  5. Step 5: Solve for x
    x = 2,795,454.10/2,415.15
  6. Step 6: Final answer
    x = 1,157.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.