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Finding the Fourth Proportional to 427,672.40, 641,662.20 and 412,312.40

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Solution

The fourth proportional to 427,672.40, 641,662.20 and 412,312.40 is: 618,616.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,672.40 : 641,662.20 = 412,312.40 : x
  2. Step 2: Convert to fraction form
    427,672.40/641,662.20 = 412,312.40/x
  3. Step 3: Cross multiply
    427,672.40x = 641,662.20 × 412,312.40
  4. Step 4: Simplify right side
    427,672.40x = 264,565,281,671.28
  5. Step 5: Solve for x
    x = 264,565,281,671.28/427,672.40
  6. Step 6: Final answer
    x = 618,616.68

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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.