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Finding the Fourth Proportional to 405,245.39, 559,251.50 and 221,479.93

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Solution

The fourth proportional to 405,245.39, 559,251.50 and 221,479.93 is: 305,649.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,245.39 : 559,251.50 = 221,479.93 : x
  2. Step 2: Convert to fraction form
    405,245.39/559,251.50 = 221,479.93/x
  3. Step 3: Cross multiply
    405,245.39x = 559,251.50 × 221,479.93
  4. Step 4: Simplify right side
    405,245.39x = 123,862,980,276.14
  5. Step 5: Solve for x
    x = 123,862,980,276.14/405,245.39
  6. Step 6: Final answer
    x = 305,649.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.