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Finding the Fourth Proportional to 785.58, 1,179.99 and 542.58

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Solution

The fourth proportional to 785.58, 1,179.99 and 542.58 is: 814.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.58 : 1,179.99 = 542.58 : x
  2. Step 2: Convert to fraction form
    785.58/1,179.99 = 542.58/x
  3. Step 3: Cross multiply
    785.58x = 1,179.99 × 542.58
  4. Step 4: Simplify right side
    785.58x = 640,238.97
  5. Step 5: Solve for x
    x = 640,238.97/785.58
  6. Step 6: Final answer
    x = 814.99

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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.