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Finding the Fourth Proportional to 408,054.60, 612,081.90 and 405,430.20

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Solution

The fourth proportional to 408,054.60, 612,081.90 and 405,430.20 is: 608,145.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,054.60 : 612,081.90 = 405,430.20 : x
  2. Step 2: Convert to fraction form
    408,054.60/612,081.90 = 405,430.20/x
  3. Step 3: Cross multiply
    408,054.60x = 612,081.90 × 405,430.20
  4. Step 4: Simplify right side
    408,054.60x = 248,156,487,133.38
  5. Step 5: Solve for x
    x = 248,156,487,133.38/408,054.60
  6. Step 6: Final answer
    x = 608,145.30

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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.