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Finding the Fourth Proportional to 847.42, 1,270.78 and 385.52

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Solution

The fourth proportional to 847.42, 1,270.78 and 385.52 is: 578.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.42 : 1,270.78 = 385.52 : x
  2. Step 2: Convert to fraction form
    847.42/1,270.78 = 385.52/x
  3. Step 3: Cross multiply
    847.42x = 1,270.78 × 385.52
  4. Step 4: Simplify right side
    847.42x = 489,903.79
  5. Step 5: Solve for x
    x = 489,903.79/847.42
  6. Step 6: Final answer
    x = 578.11

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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.