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Finding the Fourth Proportional to 788.60, 1,095.56 and 781.48

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Solution

The fourth proportional to 788.60, 1,095.56 and 781.48 is: 1,085.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.60 : 1,095.56 = 781.48 : x
  2. Step 2: Convert to fraction form
    788.60/1,095.56 = 781.48/x
  3. Step 3: Cross multiply
    788.60x = 1,095.56 × 781.48
  4. Step 4: Simplify right side
    788.60x = 856,158.23
  5. Step 5: Solve for x
    x = 856,158.23/788.60
  6. Step 6: Final answer
    x = 1,085.67

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.