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Finding the Fourth Proportional to 1,280.24, 1,916.76 and 931.28

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Solution

The fourth proportional to 1,280.24, 1,916.76 and 931.28 is: 1,394.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.24 : 1,916.76 = 931.28 : x
  2. Step 2: Convert to fraction form
    1,280.24/1,916.76 = 931.28/x
  3. Step 3: Cross multiply
    1,280.24x = 1,916.76 × 931.28
  4. Step 4: Simplify right side
    1,280.24x = 1,785,040.25
  5. Step 5: Solve for x
    x = 1,785,040.25/1,280.24
  6. Step 6: Final answer
    x = 1,394.30

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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.