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Finding the Fourth Proportional to 761.84, 1,140.94 and 679.83

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Solution

The fourth proportional to 761.84, 1,140.94 and 679.83 is: 1,018.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.84 : 1,140.94 = 679.83 : x
  2. Step 2: Convert to fraction form
    761.84/1,140.94 = 679.83/x
  3. Step 3: Cross multiply
    761.84x = 1,140.94 × 679.83
  4. Step 4: Simplify right side
    761.84x = 775,641.84
  5. Step 5: Solve for x
    x = 775,641.84/761.84
  6. Step 6: Final answer
    x = 1,018.12

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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.