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Finding the Fourth Proportional to 1,395.64, 1,925.40 and 871.84

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Solution

The fourth proportional to 1,395.64, 1,925.40 and 871.84 is: 1,202.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.64 : 1,925.40 = 871.84 : x
  2. Step 2: Convert to fraction form
    1,395.64/1,925.40 = 871.84/x
  3. Step 3: Cross multiply
    1,395.64x = 1,925.40 × 871.84
  4. Step 4: Simplify right side
    1,395.64x = 1,678,640.74
  5. Step 5: Solve for x
    x = 1,678,640.74/1,395.64
  6. Step 6: Final answer
    x = 1,202.77

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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.