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Finding the Fourth Proportional to 647,942.90, 971,914.35 and 412,330.10

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Solution

The fourth proportional to 647,942.90, 971,914.35 and 412,330.10 is: 618,495.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,942.90 : 971,914.35 = 412,330.10 : x
  2. Step 2: Convert to fraction form
    647,942.90/971,914.35 = 412,330.10/x
  3. Step 3: Cross multiply
    647,942.90x = 971,914.35 × 412,330.10
  4. Step 4: Simplify right side
    647,942.90x = 400,749,541,126.94
  5. Step 5: Solve for x
    x = 400,749,541,126.94/647,942.90
  6. Step 6: Final answer
    x = 618,495.15

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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.