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Finding the Fourth Proportional to 1,146.15, 1,717.40 and 871.40

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Solution

The fourth proportional to 1,146.15, 1,717.40 and 871.40 is: 1,305.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,146.15 : 1,717.40 = 871.40 : x
  2. Step 2: Convert to fraction form
    1,146.15/1,717.40 = 871.40/x
  3. Step 3: Cross multiply
    1,146.15x = 1,717.40 × 871.40
  4. Step 4: Simplify right side
    1,146.15x = 1,496,529.42
  5. Step 5: Solve for x
    x = 1,496,529.42/1,146.15
  6. Step 6: Final answer
    x = 1,305.70

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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.