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Finding the Fourth Proportional to 1,170.24, 1,615 and 646.28

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Solution

The fourth proportional to 1,170.24, 1,615 and 646.28 is: 891.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.24 : 1,615 = 646.28 : x
  2. Step 2: Convert to fraction form
    1,170.24/1,615 = 646.28/x
  3. Step 3: Cross multiply
    1,170.24x = 1,615 × 646.28
  4. Step 4: Simplify right side
    1,170.24x = 1,043,742.20
  5. Step 5: Solve for x
    x = 1,043,742.20/1,170.24
  6. Step 6: Final answer
    x = 891.90

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Double scale
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1.5x scale

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.