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Finding the Fourth Proportional to 3,120.53, 4,680.88 and 780.53

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Solution

The fourth proportional to 3,120.53, 4,680.88 and 780.53 is: 1,170.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.53 : 4,680.88 = 780.53 : x
  2. Step 2: Convert to fraction form
    3,120.53/4,680.88 = 780.53/x
  3. Step 3: Cross multiply
    3,120.53x = 4,680.88 × 780.53
  4. Step 4: Simplify right side
    3,120.53x = 3,653,541.91
  5. Step 5: Solve for x
    x = 3,653,541.91/3,120.53
  6. Step 6: Final answer
    x = 1,170.81

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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.