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Finding the Fourth Proportional to 643,816.80, 965,725.20 and 477,928.80

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Solution

The fourth proportional to 643,816.80, 965,725.20 and 477,928.80 is: 716,893.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,816.80 : 965,725.20 = 477,928.80 : x
  2. Step 2: Convert to fraction form
    643,816.80/965,725.20 = 477,928.80/x
  3. Step 3: Cross multiply
    643,816.80x = 965,725.20 × 477,928.80
  4. Step 4: Simplify right side
    643,816.80x = 461,547,885,965.76
  5. Step 5: Solve for x
    x = 461,547,885,965.76/643,816.80
  6. Step 6: Final answer
    x = 716,893.20

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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.