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Finding the Fourth Proportional to 660,730.32, 911,730.44 and 388,738.40

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Solution

The fourth proportional to 660,730.32, 911,730.44 and 388,738.40 is: 536,413.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,730.32 : 911,730.44 = 388,738.40 : x
  2. Step 2: Convert to fraction form
    660,730.32/911,730.44 = 388,738.40/x
  3. Step 3: Cross multiply
    660,730.32x = 911,730.44 × 388,738.40
  4. Step 4: Simplify right side
    660,730.32x = 354,424,625,974.55
  5. Step 5: Solve for x
    x = 354,424,625,974.55/660,730.32
  6. Step 6: Final answer
    x = 536,413.44

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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.