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Finding the Fourth Proportional to 1,170.12, 1,614.78 and 646.18

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Solution

The fourth proportional to 1,170.12, 1,614.78 and 646.18 is: 891.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.12 : 1,614.78 = 646.18 : x
  2. Step 2: Convert to fraction form
    1,170.12/1,614.78 = 646.18/x
  3. Step 3: Cross multiply
    1,170.12x = 1,614.78 × 646.18
  4. Step 4: Simplify right side
    1,170.12x = 1,043,438.54
  5. Step 5: Solve for x
    x = 1,043,438.54/1,170.12
  6. Step 6: Final answer
    x = 891.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.