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Finding the Fourth Proportional to 1,119.90, 1,679.79 and 572.06

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Solution

The fourth proportional to 1,119.90, 1,679.79 and 572.06 is: 858.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.90 : 1,679.79 = 572.06 : x
  2. Step 2: Convert to fraction form
    1,119.90/1,679.79 = 572.06/x
  3. Step 3: Cross multiply
    1,119.90x = 1,679.79 × 572.06
  4. Step 4: Simplify right side
    1,119.90x = 960,940.67
  5. Step 5: Solve for x
    x = 960,940.67/1,119.90
  6. Step 6: Final answer
    x = 858.06

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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.