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Finding the Fourth Proportional to 789.86, 1,087.53 and 671.60

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Solution

The fourth proportional to 789.86, 1,087.53 and 671.60 is: 924.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.86 : 1,087.53 = 671.60 : x
  2. Step 2: Convert to fraction form
    789.86/1,087.53 = 671.60/x
  3. Step 3: Cross multiply
    789.86x = 1,087.53 × 671.60
  4. Step 4: Simplify right side
    789.86x = 730,385.15
  5. Step 5: Solve for x
    x = 730,385.15/789.86
  6. Step 6: Final answer
    x = 924.70

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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.