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Finding the Fourth Proportional to 418,640.40, 627,960.60 and 134,330.40

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Solution

The fourth proportional to 418,640.40, 627,960.60 and 134,330.40 is: 201,495.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,640.40 : 627,960.60 = 134,330.40 : x
  2. Step 2: Convert to fraction form
    418,640.40/627,960.60 = 134,330.40/x
  3. Step 3: Cross multiply
    418,640.40x = 627,960.60 × 134,330.40
  4. Step 4: Simplify right side
    418,640.40x = 84,354,198,582.24
  5. Step 5: Solve for x
    x = 84,354,198,582.24/418,640.40
  6. Step 6: Final answer
    x = 201,495.60

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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.