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Finding the Fourth Proportional to 1,288.44, 1,931.40 and 854.64

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Solution

The fourth proportional to 1,288.44, 1,931.40 and 854.64 is: 1,281.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.44 : 1,931.40 = 854.64 : x
  2. Step 2: Convert to fraction form
    1,288.44/1,931.40 = 854.64/x
  3. Step 3: Cross multiply
    1,288.44x = 1,931.40 × 854.64
  4. Step 4: Simplify right side
    1,288.44x = 1,650,651.70
  5. Step 5: Solve for x
    x = 1,650,651.70/1,288.44
  6. Step 6: Final answer
    x = 1,281.12

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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.