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Finding the Fourth Proportional to 858.58, 1,292.91 and 616.79

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Solution

The fourth proportional to 858.58, 1,292.91 and 616.79 is: 928.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.58 : 1,292.91 = 616.79 : x
  2. Step 2: Convert to fraction form
    858.58/1,292.91 = 616.79/x
  3. Step 3: Cross multiply
    858.58x = 1,292.91 × 616.79
  4. Step 4: Simplify right side
    858.58x = 797,454.88
  5. Step 5: Solve for x
    x = 797,454.88/858.58
  6. Step 6: Final answer
    x = 928.81

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.