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Finding the Fourth Proportional to 426,851.11, 640,189.18 and 156,886.21

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Solution

The fourth proportional to 426,851.11, 640,189.18 and 156,886.21 is: 235,297.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,851.11 : 640,189.18 = 156,886.21 : x
  2. Step 2: Convert to fraction form
    426,851.11/640,189.18 = 156,886.21/x
  3. Step 3: Cross multiply
    426,851.11x = 640,189.18 × 156,886.21
  4. Step 4: Simplify right side
    426,851.11x = 100,436,850,147.83
  5. Step 5: Solve for x
    x = 100,436,850,147.83/426,851.11
  6. Step 6: Final answer
    x = 235,297.15

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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.