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Finding the Fourth Proportional to 660,249.16, 911,360.64 and 388,305.16

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Solution

The fourth proportional to 660,249.16, 911,360.64 and 388,305.16 is: 535,988.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,249.16 : 911,360.64 = 388,305.16 : x
  2. Step 2: Convert to fraction form
    660,249.16/911,360.64 = 388,305.16/x
  3. Step 3: Cross multiply
    660,249.16x = 911,360.64 × 388,305.16
  4. Step 4: Simplify right side
    660,249.16x = 353,886,039,132.90
  5. Step 5: Solve for x
    x = 353,886,039,132.90/660,249.16
  6. Step 6: Final answer
    x = 535,988.62

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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.