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Finding the Fourth Proportional to 847.64, 1,271.16 and 385.03

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Solution

The fourth proportional to 847.64, 1,271.16 and 385.03 is: 577.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.64 : 1,271.16 = 385.03 : x
  2. Step 2: Convert to fraction form
    847.64/1,271.16 = 385.03/x
  3. Step 3: Cross multiply
    847.64x = 1,271.16 × 385.03
  4. Step 4: Simplify right side
    847.64x = 489,434.73
  5. Step 5: Solve for x
    x = 489,434.73/847.64
  6. Step 6: Final answer
    x = 577.41

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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.