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Finding the Fourth Proportional to 1,080.42, 1,620.64 and 865.36

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Solution

The fourth proportional to 1,080.42, 1,620.64 and 865.36 is: 1,298.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.42 : 1,620.64 = 865.36 : x
  2. Step 2: Convert to fraction form
    1,080.42/1,620.64 = 865.36/x
  3. Step 3: Cross multiply
    1,080.42x = 1,620.64 × 865.36
  4. Step 4: Simplify right side
    1,080.42x = 1,402,437.03
  5. Step 5: Solve for x
    x = 1,402,437.03/1,080.42
  6. Step 6: Final answer
    x = 1,298.05

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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.