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Finding the Fourth Proportional to 877.86, 1,318.41 and 788.73

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Solution

The fourth proportional to 877.86, 1,318.41 and 788.73 is: 1,184.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.86 : 1,318.41 = 788.73 : x
  2. Step 2: Convert to fraction form
    877.86/1,318.41 = 788.73/x
  3. Step 3: Cross multiply
    877.86x = 1,318.41 × 788.73
  4. Step 4: Simplify right side
    877.86x = 1,039,869.52
  5. Step 5: Solve for x
    x = 1,039,869.52/877.86
  6. Step 6: Final answer
    x = 1,184.55

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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.