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Finding the Fourth Proportional to 1,192.60, 1,788.85 and 645.85

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Solution

The fourth proportional to 1,192.60, 1,788.85 and 645.85 is: 968.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.60 : 1,788.85 = 645.85 : x
  2. Step 2: Convert to fraction form
    1,192.60/1,788.85 = 645.85/x
  3. Step 3: Cross multiply
    1,192.60x = 1,788.85 × 645.85
  4. Step 4: Simplify right side
    1,192.60x = 1,155,328.77
  5. Step 5: Solve for x
    x = 1,155,328.77/1,192.60
  6. Step 6: Final answer
    x = 968.75

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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.