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Finding the Fourth Proportional to 405,999.80, 608,999.70 and 125,545.40

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Solution

The fourth proportional to 405,999.80, 608,999.70 and 125,545.40 is: 188,318.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,999.80 : 608,999.70 = 125,545.40 : x
  2. Step 2: Convert to fraction form
    405,999.80/608,999.70 = 125,545.40/x
  3. Step 3: Cross multiply
    405,999.80x = 608,999.70 × 125,545.40
  4. Step 4: Simplify right side
    405,999.80x = 76,457,110,936.38
  5. Step 5: Solve for x
    x = 76,457,110,936.38/405,999.80
  6. Step 6: Final answer
    x = 188,318.10

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1.5x scale

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.