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Finding the Fourth Proportional to 660,741.50, 911,745.91 and 388,749.58

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Solution

The fourth proportional to 660,741.50, 911,745.91 and 388,749.58 is: 536,428.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,741.50 : 911,745.91 = 388,749.58 : x
  2. Step 2: Convert to fraction form
    660,741.50/911,745.91 = 388,749.58/x
  3. Step 3: Cross multiply
    660,741.50x = 911,745.91 × 388,749.58
  4. Step 4: Simplify right side
    660,741.50x = 354,440,839,579.22
  5. Step 5: Solve for x
    x = 354,440,839,579.22/660,741.50
  6. Step 6: Final answer
    x = 536,428.91

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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.