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Finding the Fourth Proportional to 660,266.74, 911,171.91 and 388,346.14

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Solution

The fourth proportional to 660,266.74, 911,171.91 and 388,346.14 is: 535,919.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,266.74 : 911,171.91 = 388,346.14 : x
  2. Step 2: Convert to fraction form
    660,266.74/911,171.91 = 388,346.14/x
  3. Step 3: Cross multiply
    660,266.74x = 911,171.91 × 388,346.14
  4. Step 4: Simplify right side
    660,266.74x = 353,850,094,124.93
  5. Step 5: Solve for x
    x = 353,850,094,124.93/660,266.74
  6. Step 6: Final answer
    x = 535,919.91

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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.