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Finding the Fourth Proportional to 1,280.95, 1,921.26 and 356.58

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Solution

The fourth proportional to 1,280.95, 1,921.26 and 356.58 is: 534.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.95 : 1,921.26 = 356.58 : x
  2. Step 2: Convert to fraction form
    1,280.95/1,921.26 = 356.58/x
  3. Step 3: Cross multiply
    1,280.95x = 1,921.26 × 356.58
  4. Step 4: Simplify right side
    1,280.95x = 685,082.63
  5. Step 5: Solve for x
    x = 685,082.63/1,280.95
  6. Step 6: Final answer
    x = 534.82

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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.