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Finding the Fourth Proportional to 2,415.90, 3,622.84 and 772.01

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Solution

The fourth proportional to 2,415.90, 3,622.84 and 772.01 is: 1,157.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,415.90 : 3,622.84 = 772.01 : x
  2. Step 2: Convert to fraction form
    2,415.90/3,622.84 = 772.01/x
  3. Step 3: Cross multiply
    2,415.90x = 3,622.84 × 772.01
  4. Step 4: Simplify right side
    2,415.90x = 2,796,848.66
  5. Step 5: Solve for x
    x = 2,796,848.66/2,415.90
  6. Step 6: Final answer
    x = 1,157.68

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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.