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Finding the Fourth Proportional to 426,575.40, 639,863.10 and 420,354.60

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Solution

The fourth proportional to 426,575.40, 639,863.10 and 420,354.60 is: 630,531.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,575.40 : 639,863.10 = 420,354.60 : x
  2. Step 2: Convert to fraction form
    426,575.40/639,863.10 = 420,354.60/x
  3. Step 3: Cross multiply
    426,575.40x = 639,863.10 × 420,354.60
  4. Step 4: Simplify right side
    426,575.40x = 268,969,397,455.26
  5. Step 5: Solve for x
    x = 268,969,397,455.26/426,575.40
  6. Step 6: Final answer
    x = 630,531.90

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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.