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Finding the Fourth Proportional to 643,692.85, 888,205.46 and 385,509.30

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Solution

The fourth proportional to 643,692.85, 888,205.46 and 385,509.30 is: 531,948.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,692.85 : 888,205.46 = 385,509.30 : x
  2. Step 2: Convert to fraction form
    643,692.85/888,205.46 = 385,509.30/x
  3. Step 3: Cross multiply
    643,692.85x = 888,205.46 × 385,509.30
  4. Step 4: Simplify right side
    643,692.85x = 342,411,466,104.55
  5. Step 5: Solve for x
    x = 342,411,466,104.55/643,692.85
  6. Step 6: Final answer
    x = 531,948.53

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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.