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Finding the Fourth Proportional to 1,286.34, 1,774.17 and 912.93

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Solution

The fourth proportional to 1,286.34, 1,774.17 and 912.93 is: 1,259.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.34 : 1,774.17 = 912.93 : x
  2. Step 2: Convert to fraction form
    1,286.34/1,774.17 = 912.93/x
  3. Step 3: Cross multiply
    1,286.34x = 1,774.17 × 912.93
  4. Step 4: Simplify right side
    1,286.34x = 1,619,693.02
  5. Step 5: Solve for x
    x = 1,619,693.02/1,286.34
  6. Step 6: Final answer
    x = 1,259.15

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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.