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Finding the Fourth Proportional to 2,047.62, 3,072.64 and 815.60

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Solution

The fourth proportional to 2,047.62, 3,072.64 and 815.60 is: 1,223.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,047.62 : 3,072.64 = 815.60 : x
  2. Step 2: Convert to fraction form
    2,047.62/3,072.64 = 815.60/x
  3. Step 3: Cross multiply
    2,047.62x = 3,072.64 × 815.60
  4. Step 4: Simplify right side
    2,047.62x = 2,506,045.18
  5. Step 5: Solve for x
    x = 2,506,045.18/2,047.62
  6. Step 6: Final answer
    x = 1,223.88

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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.