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Finding the Fourth Proportional to 1,077.50, 1,616.29 and 428.29

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Solution

The fourth proportional to 1,077.50, 1,616.29 and 428.29 is: 642.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.50 : 1,616.29 = 428.29 : x
  2. Step 2: Convert to fraction form
    1,077.50/1,616.29 = 428.29/x
  3. Step 3: Cross multiply
    1,077.50x = 1,616.29 × 428.29
  4. Step 4: Simplify right side
    1,077.50x = 692,235.73
  5. Step 5: Solve for x
    x = 692,235.73/1,077.50
  6. Step 6: Final answer
    x = 642.44

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Double scale
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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.