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Finding the Fourth Proportional to 418,785.18, 628,118.46 and 134,438.30

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Solution

The fourth proportional to 418,785.18, 628,118.46 and 134,438.30 is: 201,638.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,785.18 : 628,118.46 = 134,438.30 : x
  2. Step 2: Convert to fraction form
    418,785.18/628,118.46 = 134,438.30/x
  3. Step 3: Cross multiply
    418,785.18x = 628,118.46 × 134,438.30
  4. Step 4: Simplify right side
    418,785.18x = 84,443,174,820.43
  5. Step 5: Solve for x
    x = 84,443,174,820.43/418,785.18
  6. Step 6: Final answer
    x = 201,638.40

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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.