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Finding the Fourth Proportional to 784.92, 1,177.90 and 778.84

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Solution

The fourth proportional to 784.92, 1,177.90 and 778.84 is: 1,168.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.92 : 1,177.90 = 778.84 : x
  2. Step 2: Convert to fraction form
    784.92/1,177.90 = 778.84/x
  3. Step 3: Cross multiply
    784.92x = 1,177.90 × 778.84
  4. Step 4: Simplify right side
    784.92x = 917,395.64
  5. Step 5: Solve for x
    x = 917,395.64/784.92
  6. Step 6: Final answer
    x = 1,168.78

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1.5x scale

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.