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Finding the Fourth Proportional to 957.68, 1,321.12 and 642.48

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Solution

The fourth proportional to 957.68, 1,321.12 and 642.48 is: 886.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.68 : 1,321.12 = 642.48 : x
  2. Step 2: Convert to fraction form
    957.68/1,321.12 = 642.48/x
  3. Step 3: Cross multiply
    957.68x = 1,321.12 × 642.48
  4. Step 4: Simplify right side
    957.68x = 848,793.18
  5. Step 5: Solve for x
    x = 848,793.18/957.68
  6. Step 6: Final answer
    x = 886.30

Related Problems

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Half scale
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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.