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Finding the Fourth Proportional to 405,909.80, 608,864.70 and 125,426.60

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Solution

The fourth proportional to 405,909.80, 608,864.70 and 125,426.60 is: 188,139.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,909.80 : 608,864.70 = 125,426.60 : x
  2. Step 2: Convert to fraction form
    405,909.80/608,864.70 = 125,426.60/x
  3. Step 3: Cross multiply
    405,909.80x = 608,864.70 × 125,426.60
  4. Step 4: Simplify right side
    405,909.80x = 76,367,829,181.02
  5. Step 5: Solve for x
    x = 76,367,829,181.02/405,909.80
  6. Step 6: Final answer
    x = 188,139.90

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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.