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Finding the Fourth Proportional to 405,986.40, 608,720.40 and 169,423.20

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Solution

The fourth proportional to 405,986.40, 608,720.40 and 169,423.20 is: 254,026.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,986.40 : 608,720.40 = 169,423.20 : x
  2. Step 2: Convert to fraction form
    405,986.40/608,720.40 = 169,423.20/x
  3. Step 3: Cross multiply
    405,986.40x = 608,720.40 × 169,423.20
  4. Step 4: Simplify right side
    405,986.40x = 103,131,358,073.28
  5. Step 5: Solve for x
    x = 103,131,358,073.28/405,986.40
  6. Step 6: Final answer
    x = 254,026.63

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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.