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Finding the Fourth Proportional to 851.20, 1,276.76 and 646.16

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Solution

The fourth proportional to 851.20, 1,276.76 and 646.16 is: 969.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.20 : 1,276.76 = 646.16 : x
  2. Step 2: Convert to fraction form
    851.20/1,276.76 = 646.16/x
  3. Step 3: Cross multiply
    851.20x = 1,276.76 × 646.16
  4. Step 4: Simplify right side
    851.20x = 824,991.24
  5. Step 5: Solve for x
    x = 824,991.24/851.20
  6. Step 6: Final answer
    x = 969.21

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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.