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Finding the Fourth Proportional to 1,355.73, 1,871.42 and 912.75

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Solution

The fourth proportional to 1,355.73, 1,871.42 and 912.75 is: 1,259.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.73 : 1,871.42 = 912.75 : x
  2. Step 2: Convert to fraction form
    1,355.73/1,871.42 = 912.75/x
  3. Step 3: Cross multiply
    1,355.73x = 1,871.42 × 912.75
  4. Step 4: Simplify right side
    1,355.73x = 1,708,134.04
  5. Step 5: Solve for x
    x = 1,708,134.04/1,355.73
  6. Step 6: Final answer
    x = 1,259.94

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.