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Finding the Fourth Proportional to 761.44, 1,140.86 and 645.86

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Solution

The fourth proportional to 761.44, 1,140.86 and 645.86 is: 967.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.44 : 1,140.86 = 645.86 : x
  2. Step 2: Convert to fraction form
    761.44/1,140.86 = 645.86/x
  3. Step 3: Cross multiply
    761.44x = 1,140.86 × 645.86
  4. Step 4: Simplify right side
    761.44x = 736,835.84
  5. Step 5: Solve for x
    x = 736,835.84/761.44
  6. Step 6: Final answer
    x = 967.69

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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.