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Finding the Fourth Proportional to 779.20, 1,168.36 and 388.41

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Solution

The fourth proportional to 779.20, 1,168.36 and 388.41 is: 582.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.20 : 1,168.36 = 388.41 : x
  2. Step 2: Convert to fraction form
    779.20/1,168.36 = 388.41/x
  3. Step 3: Cross multiply
    779.20x = 1,168.36 × 388.41
  4. Step 4: Simplify right side
    779.20x = 453,802.71
  5. Step 5: Solve for x
    x = 453,802.71/779.20
  6. Step 6: Final answer
    x = 582.40

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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.