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Finding the Fourth Proportional to 911.52, 1,359.72 and 855.63

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Solution

The fourth proportional to 911.52, 1,359.72 and 855.63 is: 1,276.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.52 : 1,359.72 = 855.63 : x
  2. Step 2: Convert to fraction form
    911.52/1,359.72 = 855.63/x
  3. Step 3: Cross multiply
    911.52x = 1,359.72 × 855.63
  4. Step 4: Simplify right side
    911.52x = 1,163,417.22
  5. Step 5: Solve for x
    x = 1,163,417.22/911.52
  6. Step 6: Final answer
    x = 1,276.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.