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Finding the Fourth Proportional to 426,460.80, 639,281.60 and 331,638.40

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Solution

The fourth proportional to 426,460.80, 639,281.60 and 331,638.40 is: 497,139.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,460.80 : 639,281.60 = 331,638.40 : x
  2. Step 2: Convert to fraction form
    426,460.80/639,281.60 = 331,638.40/x
  3. Step 3: Cross multiply
    426,460.80x = 639,281.60 × 331,638.40
  4. Step 4: Simplify right side
    426,460.80x = 212,010,326,973.44
  5. Step 5: Solve for x
    x = 212,010,326,973.44/426,460.80
  6. Step 6: Final answer
    x = 497,139.07

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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.