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Finding the Fourth Proportional to 753.62, 1,038.98 and 644.27

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Solution

The fourth proportional to 753.62, 1,038.98 and 644.27 is: 888.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.62 : 1,038.98 = 644.27 : x
  2. Step 2: Convert to fraction form
    753.62/1,038.98 = 644.27/x
  3. Step 3: Cross multiply
    753.62x = 1,038.98 × 644.27
  4. Step 4: Simplify right side
    753.62x = 669,380.42
  5. Step 5: Solve for x
    x = 669,380.42/753.62
  6. Step 6: Final answer
    x = 888.22

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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.