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Finding the Fourth Proportional to 1,079.15, 1,618.76 and 385.86

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Solution

The fourth proportional to 1,079.15, 1,618.76 and 385.86 is: 578.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.15 : 1,618.76 = 385.86 : x
  2. Step 2: Convert to fraction form
    1,079.15/1,618.76 = 385.86/x
  3. Step 3: Cross multiply
    1,079.15x = 1,618.76 × 385.86
  4. Step 4: Simplify right side
    1,079.15x = 624,612.80
  5. Step 5: Solve for x
    x = 624,612.80/1,079.15
  6. Step 6: Final answer
    x = 578.80

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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.