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Finding the Fourth Proportional to 1,312.64, 1,811.88 and 871.28

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Solution

The fourth proportional to 1,312.64, 1,811.88 and 871.28 is: 1,202.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.64 : 1,811.88 = 871.28 : x
  2. Step 2: Convert to fraction form
    1,312.64/1,811.88 = 871.28/x
  3. Step 3: Cross multiply
    1,312.64x = 1,811.88 × 871.28
  4. Step 4: Simplify right side
    1,312.64x = 1,578,654.81
  5. Step 5: Solve for x
    x = 1,578,654.81/1,312.64
  6. Step 6: Final answer
    x = 1,202.66

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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.