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Finding the Fourth Proportional to 405,681.40, 608,894.10 and 206,140.60

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Solution

The fourth proportional to 405,681.40, 608,894.10 and 206,140.60 is: 309,399.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,681.40 : 608,894.10 = 206,140.60 : x
  2. Step 2: Convert to fraction form
    405,681.40/608,894.10 = 206,140.60/x
  3. Step 3: Cross multiply
    405,681.40x = 608,894.10 × 206,140.60
  4. Step 4: Simplify right side
    405,681.40x = 125,517,795,110.46
  5. Step 5: Solve for x
    x = 125,517,795,110.46/405,681.40
  6. Step 6: Final answer
    x = 309,399.93

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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.