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Finding the Fourth Proportional to 847.93, 1,270.08 and 640.21

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Solution

The fourth proportional to 847.93, 1,270.08 and 640.21 is: 958.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.93 : 1,270.08 = 640.21 : x
  2. Step 2: Convert to fraction form
    847.93/1,270.08 = 640.21/x
  3. Step 3: Cross multiply
    847.93x = 1,270.08 × 640.21
  4. Step 4: Simplify right side
    847.93x = 813,117.92
  5. Step 5: Solve for x
    x = 813,117.92/847.93
  6. Step 6: Final answer
    x = 958.94

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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.