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Finding the Fourth Proportional to 412,205.40, 618,308.10 and 342,221.40

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Solution

The fourth proportional to 412,205.40, 618,308.10 and 342,221.40 is: 513,332.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    412,205.40 : 618,308.10 = 342,221.40 : x
  2. Step 2: Convert to fraction form
    412,205.40/618,308.10 = 342,221.40/x
  3. Step 3: Cross multiply
    412,205.40x = 618,308.10 × 342,221.40
  4. Step 4: Simplify right side
    412,205.40x = 211,598,263,613.34
  5. Step 5: Solve for x
    x = 211,598,263,613.34/412,205.40
  6. Step 6: Final answer
    x = 513,332.10

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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.