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Finding the Fourth Proportional to 678,493.60, 1,017,740.40 and 413,072.80

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Solution

The fourth proportional to 678,493.60, 1,017,740.40 and 413,072.80 is: 619,609.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,493.60 : 1,017,740.40 = 413,072.80 : x
  2. Step 2: Convert to fraction form
    678,493.60/1,017,740.40 = 413,072.80/x
  3. Step 3: Cross multiply
    678,493.60x = 1,017,740.40 × 413,072.80
  4. Step 4: Simplify right side
    678,493.60x = 420,400,876,701.12
  5. Step 5: Solve for x
    x = 420,400,876,701.12/678,493.60
  6. Step 6: Final answer
    x = 619,609.20

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1.5x scale

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.