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Finding the Fourth Proportional to 1,280.02, 1,916.62 and 731.46

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Solution

The fourth proportional to 1,280.02, 1,916.62 and 731.46 is: 1,095.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.02 : 1,916.62 = 731.46 : x
  2. Step 2: Convert to fraction form
    1,280.02/1,916.62 = 731.46/x
  3. Step 3: Cross multiply
    1,280.02x = 1,916.62 × 731.46
  4. Step 4: Simplify right side
    1,280.02x = 1,401,930.87
  5. Step 5: Solve for x
    x = 1,401,930.87/1,280.02
  6. Step 6: Final answer
    x = 1,095.24

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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.