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Finding the Fourth Proportional to 643,841.60, 965,762.40 and 312,065.60

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Solution

The fourth proportional to 643,841.60, 965,762.40 and 312,065.60 is: 468,098.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,841.60 : 965,762.40 = 312,065.60 : x
  2. Step 2: Convert to fraction form
    643,841.60/965,762.40 = 312,065.60/x
  3. Step 3: Cross multiply
    643,841.60x = 965,762.40 × 312,065.60
  4. Step 4: Simplify right side
    643,841.60x = 301,381,222,813.44
  5. Step 5: Solve for x
    x = 301,381,222,813.44/643,841.60
  6. Step 6: Final answer
    x = 468,098.40

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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.