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Finding the Fourth Proportional to 427,293.80, 640,940.70 and 418,999.40

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Solution

The fourth proportional to 427,293.80, 640,940.70 and 418,999.40 is: 628,499.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,293.80 : 640,940.70 = 418,999.40 : x
  2. Step 2: Convert to fraction form
    427,293.80/640,940.70 = 418,999.40/x
  3. Step 3: Cross multiply
    427,293.80x = 640,940.70 × 418,999.40
  4. Step 4: Simplify right side
    427,293.80x = 268,553,768,735.58
  5. Step 5: Solve for x
    x = 268,553,768,735.58/427,293.80
  6. Step 6: Final answer
    x = 628,499.10

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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.