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Finding the Fourth Proportional to 761.79, 1,141.69 and 391.28

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Solution

The fourth proportional to 761.79, 1,141.69 and 391.28 is: 586.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.79 : 1,141.69 = 391.28 : x
  2. Step 2: Convert to fraction form
    761.79/1,141.69 = 391.28/x
  3. Step 3: Cross multiply
    761.79x = 1,141.69 × 391.28
  4. Step 4: Simplify right side
    761.79x = 446,719.49
  5. Step 5: Solve for x
    x = 446,719.49/761.79
  6. Step 6: Final answer
    x = 586.41

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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.