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Finding the Fourth Proportional to 1,280.69, 1,921.07 and 356.25

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Solution

The fourth proportional to 1,280.69, 1,921.07 and 356.25 is: 534.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.69 : 1,921.07 = 356.25 : x
  2. Step 2: Convert to fraction form
    1,280.69/1,921.07 = 356.25/x
  3. Step 3: Cross multiply
    1,280.69x = 1,921.07 × 356.25
  4. Step 4: Simplify right side
    1,280.69x = 684,381.19
  5. Step 5: Solve for x
    x = 684,381.19/1,280.69
  6. Step 6: Final answer
    x = 534.38

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Double scale
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1.5x scale

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.