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Finding the Fourth Proportional to 762.40, 1,051.94 and 644.86

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Solution

The fourth proportional to 762.40, 1,051.94 and 644.86 is: 889.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.40 : 1,051.94 = 644.86 : x
  2. Step 2: Convert to fraction form
    762.40/1,051.94 = 644.86/x
  3. Step 3: Cross multiply
    762.40x = 1,051.94 × 644.86
  4. Step 4: Simplify right side
    762.40x = 678,354.03
  5. Step 5: Solve for x
    x = 678,354.03/762.40
  6. Step 6: Final answer
    x = 889.76

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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.