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Finding the Fourth Proportional to 418,523.20, 627,784.80 and 221,915.20

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Solution

The fourth proportional to 418,523.20, 627,784.80 and 221,915.20 is: 332,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,523.20 : 627,784.80 = 221,915.20 : x
  2. Step 2: Convert to fraction form
    418,523.20/627,784.80 = 221,915.20/x
  3. Step 3: Cross multiply
    418,523.20x = 627,784.80 × 221,915.20
  4. Step 4: Simplify right side
    418,523.20x = 139,314,989,448.96
  5. Step 5: Solve for x
    x = 139,314,989,448.96/418,523.20
  6. Step 6: Final answer
    x = 332,872.80

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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.