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Finding the Fourth Proportional to 1,170.28, 1,615.10 and 646.35

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Solution

The fourth proportional to 1,170.28, 1,615.10 and 646.35 is: 892.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.28 : 1,615.10 = 646.35 : x
  2. Step 2: Convert to fraction form
    1,170.28/1,615.10 = 646.35/x
  3. Step 3: Cross multiply
    1,170.28x = 1,615.10 × 646.35
  4. Step 4: Simplify right side
    1,170.28x = 1,043,919.89
  5. Step 5: Solve for x
    x = 1,043,919.89/1,170.28
  6. Step 6: Final answer
    x = 892.03

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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.