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Finding the Fourth Proportional to 627,689.20, 866,226 and 355,784.80

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Solution

The fourth proportional to 627,689.20, 866,226 and 355,784.80 is: 490,991.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    627,689.20 : 866,226 = 355,784.80 : x
  2. Step 2: Convert to fraction form
    627,689.20/866,226 = 355,784.80/x
  3. Step 3: Cross multiply
    627,689.20x = 866,226 × 355,784.80
  4. Step 4: Simplify right side
    627,689.20x = 308,190,044,164.80
  5. Step 5: Solve for x
    x = 308,190,044,164.80/627,689.20
  6. Step 6: Final answer
    x = 490,991.47

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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.