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Finding the Fourth Proportional to 940.16, 1,297.68 and 646.16

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Solution

The fourth proportional to 940.16, 1,297.68 and 646.16 is: 891.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.16 : 1,297.68 = 646.16 : x
  2. Step 2: Convert to fraction form
    940.16/1,297.68 = 646.16/x
  3. Step 3: Cross multiply
    940.16x = 1,297.68 × 646.16
  4. Step 4: Simplify right side
    940.16x = 838,508.91
  5. Step 5: Solve for x
    x = 838,508.91/940.16
  6. Step 6: Final answer
    x = 891.88

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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.