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Finding the Fourth Proportional to 405,328.40, 607,992.60 and 124,809.20

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Solution

The fourth proportional to 405,328.40, 607,992.60 and 124,809.20 is: 187,213.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,328.40 : 607,992.60 = 124,809.20 : x
  2. Step 2: Convert to fraction form
    405,328.40/607,992.60 = 124,809.20/x
  3. Step 3: Cross multiply
    405,328.40x = 607,992.60 × 124,809.20
  4. Step 4: Simplify right side
    405,328.40x = 75,883,070,011.92
  5. Step 5: Solve for x
    x = 75,883,070,011.92/405,328.40
  6. Step 6: Final answer
    x = 187,213.80

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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.