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Finding the Fourth Proportional to 2,125.47, 3,188.11 and 644.63

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Solution

The fourth proportional to 2,125.47, 3,188.11 and 644.63 is: 966.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,125.47 : 3,188.11 = 644.63 : x
  2. Step 2: Convert to fraction form
    2,125.47/3,188.11 = 644.63/x
  3. Step 3: Cross multiply
    2,125.47x = 3,188.11 × 644.63
  4. Step 4: Simplify right side
    2,125.47x = 2,055,161.91
  5. Step 5: Solve for x
    x = 2,055,161.91/2,125.47
  6. Step 6: Final answer
    x = 966.92

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1.5x scale

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.