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Finding the Fourth Proportional to 858.66, 1,287.38 and 611.86

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Solution

The fourth proportional to 858.66, 1,287.38 and 611.86 is: 917.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.66 : 1,287.38 = 611.86 : x
  2. Step 2: Convert to fraction form
    858.66/1,287.38 = 611.86/x
  3. Step 3: Cross multiply
    858.66x = 1,287.38 × 611.86
  4. Step 4: Simplify right side
    858.66x = 787,693.61
  5. Step 5: Solve for x
    x = 787,693.61/858.66
  6. Step 6: Final answer
    x = 917.36

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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.