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Finding the Fourth Proportional to 3,788, 5,225.72 and 2,215.40

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Solution

The fourth proportional to 3,788, 5,225.72 and 2,215.40 is: 3,056.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,788 : 5,225.72 = 2,215.40 : x
  2. Step 2: Convert to fraction form
    3,788/5,225.72 = 2,215.40/x
  3. Step 3: Cross multiply
    3,788x = 5,225.72 × 2,215.40
  4. Step 4: Simplify right side
    3,788x = 11,577,060.09
  5. Step 5: Solve for x
    x = 11,577,060.09/3,788
  6. Step 6: Final answer
    x = 3,056.25

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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.