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Finding the Fourth Proportional to 852.15, 1,276.65 and 440.28

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Solution

The fourth proportional to 852.15, 1,276.65 and 440.28 is: 659.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.15 : 1,276.65 = 440.28 : x
  2. Step 2: Convert to fraction form
    852.15/1,276.65 = 440.28/x
  3. Step 3: Cross multiply
    852.15x = 1,276.65 × 440.28
  4. Step 4: Simplify right side
    852.15x = 562,083.46
  5. Step 5: Solve for x
    x = 562,083.46/852.15
  6. Step 6: Final answer
    x = 659.61

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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.