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Finding the Fourth Proportional to 426,462.80, 639,284.60 and 331,640.40

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Solution

The fourth proportional to 426,462.80, 639,284.60 and 331,640.40 is: 497,142.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,462.80 : 639,284.60 = 331,640.40 : x
  2. Step 2: Convert to fraction form
    426,462.80/639,284.60 = 331,640.40/x
  3. Step 3: Cross multiply
    426,462.80x = 639,284.60 × 331,640.40
  4. Step 4: Simplify right side
    426,462.80x = 212,012,600,457.84
  5. Step 5: Solve for x
    x = 212,012,600,457.84/426,462.80
  6. Step 6: Final answer
    x = 497,142.07

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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.