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Finding the Fourth Proportional to 705,090.21, 973,084.69 and 399,220.48

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Solution

The fourth proportional to 705,090.21, 973,084.69 and 399,220.48 is: 550,958.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    705,090.21 : 973,084.69 = 399,220.48 : x
  2. Step 2: Convert to fraction form
    705,090.21/973,084.69 = 399,220.48/x
  3. Step 3: Cross multiply
    705,090.21x = 973,084.69 × 399,220.48
  4. Step 4: Simplify right side
    705,090.21x = 388,475,337,022.45
  5. Step 5: Solve for x
    x = 388,475,337,022.45/705,090.21
  6. Step 6: Final answer
    x = 550,958.35

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Double scale
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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.