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Finding the Fourth Proportional to 977.28, 1,464.72 and 855.12

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Solution

The fourth proportional to 977.28, 1,464.72 and 855.12 is: 1,281.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.28 : 1,464.72 = 855.12 : x
  2. Step 2: Convert to fraction form
    977.28/1,464.72 = 855.12/x
  3. Step 3: Cross multiply
    977.28x = 1,464.72 × 855.12
  4. Step 4: Simplify right side
    977.28x = 1,252,511.37
  5. Step 5: Solve for x
    x = 1,252,511.37/977.28
  6. Step 6: Final answer
    x = 1,281.63

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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.