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Finding the Fourth Proportional to 847.96, 1,170.82 and 553.40

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Solution

The fourth proportional to 847.96, 1,170.82 and 553.40 is: 764.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.96 : 1,170.82 = 553.40 : x
  2. Step 2: Convert to fraction form
    847.96/1,170.82 = 553.40/x
  3. Step 3: Cross multiply
    847.96x = 1,170.82 × 553.40
  4. Step 4: Simplify right side
    847.96x = 647,931.79
  5. Step 5: Solve for x
    x = 647,931.79/847.96
  6. Step 6: Final answer
    x = 764.11

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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.