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Finding the Fourth Proportional to 660,739.75, 911,743.50 and 388,747.83

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Solution

The fourth proportional to 660,739.75, 911,743.50 and 388,747.83 is: 536,426.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,739.75 : 911,743.50 = 388,747.83 : x
  2. Step 2: Convert to fraction form
    660,739.75/911,743.50 = 388,747.83/x
  3. Step 3: Cross multiply
    660,739.75x = 911,743.50 × 388,747.83
  4. Step 4: Simplify right side
    660,739.75x = 354,438,307,141.61
  5. Step 5: Solve for x
    x = 354,438,307,141.61/660,739.75
  6. Step 6: Final answer
    x = 536,426.49

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1.5x scale

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.