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Finding the Fourth Proportional to 911,154.42, 1,365,879.51 and 405,440.64

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Solution

The fourth proportional to 911,154.42, 1,365,879.51 and 405,440.64 is: 607,781.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    911,154.42 : 1,365,879.51 = 405,440.64 : x
  2. Step 2: Convert to fraction form
    911,154.42/1,365,879.51 = 405,440.64/x
  3. Step 3: Cross multiply
    911,154.42x = 1,365,879.51 × 405,440.64
  4. Step 4: Simplify right side
    911,154.42x = 553,783,062,697.29
  5. Step 5: Solve for x
    x = 553,783,062,697.29/911,154.42
  6. Step 6: Final answer
    x = 607,781.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.