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Finding the Fourth Proportional to 786.54, 1,177.76 and 631.64

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Solution

The fourth proportional to 786.54, 1,177.76 and 631.64 is: 945.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.54 : 1,177.76 = 631.64 : x
  2. Step 2: Convert to fraction form
    786.54/1,177.76 = 631.64/x
  3. Step 3: Cross multiply
    786.54x = 1,177.76 × 631.64
  4. Step 4: Simplify right side
    786.54x = 743,911.28
  5. Step 5: Solve for x
    x = 743,911.28/786.54
  6. Step 6: Final answer
    x = 945.80

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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.