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Finding the Fourth Proportional to 1,062.60, 1,590.76 and 789.90

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Solution

The fourth proportional to 1,062.60, 1,590.76 and 789.90 is: 1,182.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,062.60 : 1,590.76 = 789.90 : x
  2. Step 2: Convert to fraction form
    1,062.60/1,590.76 = 789.90/x
  3. Step 3: Cross multiply
    1,062.60x = 1,590.76 × 789.90
  4. Step 4: Simplify right side
    1,062.60x = 1,256,539.35
  5. Step 5: Solve for x
    x = 1,256,539.35/1,062.60
  6. Step 6: Final answer
    x = 1,182.51

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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.