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Finding the Fourth Proportional to 858, 1,185.30 and 564.24

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Solution

The fourth proportional to 858, 1,185.30 and 564.24 is: 779.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    858 : 1,185.30 = 564.24 : x
  2. Step 2: Convert to fraction form
    858/1,185.30 = 564.24/x
  3. Step 3: Cross multiply
    858x = 1,185.30 × 564.24
  4. Step 4: Simplify right side
    858x = 668,793.67
  5. Step 5: Solve for x
    x = 668,793.67/858
  6. Step 6: Final answer
    x = 779.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.