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Finding the Fourth Proportional to 628,879.20, 943,318.80 and 439,922.40

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Solution

The fourth proportional to 628,879.20, 943,318.80 and 439,922.40 is: 659,883.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,879.20 : 943,318.80 = 439,922.40 : x
  2. Step 2: Convert to fraction form
    628,879.20/943,318.80 = 439,922.40/x
  3. Step 3: Cross multiply
    628,879.20x = 943,318.80 × 439,922.40
  4. Step 4: Simplify right side
    628,879.20x = 414,987,070,461.12
  5. Step 5: Solve for x
    x = 414,987,070,461.12/628,879.20
  6. Step 6: Final answer
    x = 659,883.60

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Double scale
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Similar ratio
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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.