Home / 643,845.60-965,768.40-312,069.60

Finding the Fourth Proportional to 643,845.60, 965,768.40 and 312,069.60

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Solution

The fourth proportional to 643,845.60, 965,768.40 and 312,069.60 is: 468,104.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,845.60 : 965,768.40 = 312,069.60 : x
  2. Step 2: Convert to fraction form
    643,845.60/965,768.40 = 312,069.60/x
  3. Step 3: Cross multiply
    643,845.60x = 965,768.40 × 312,069.60
  4. Step 4: Simplify right side
    643,845.60x = 301,386,958,280.64
  5. Step 5: Solve for x
    x = 301,386,958,280.64/643,845.60
  6. Step 6: Final answer
    x = 468,104.40

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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.