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Finding the Fourth Proportional to 626,855.20, 865,079.88 and 354,918.40

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Solution

The fourth proportional to 626,855.20, 865,079.88 and 354,918.40 is: 489,798.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    626,855.20 : 865,079.88 = 354,918.40 : x
  2. Step 2: Convert to fraction form
    626,855.20/865,079.88 = 354,918.40/x
  3. Step 3: Cross multiply
    626,855.20x = 865,079.88 × 354,918.40
  4. Step 4: Simplify right side
    626,855.20x = 307,032,766,881.79
  5. Step 5: Solve for x
    x = 307,032,766,881.79/626,855.20
  6. Step 6: Final answer
    x = 489,798.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.