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Finding the Fourth Proportional to 958.76, 1,321.68 and 678.08

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Solution

The fourth proportional to 958.76, 1,321.68 and 678.08 is: 934.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.76 : 1,321.68 = 678.08 : x
  2. Step 2: Convert to fraction form
    958.76/1,321.68 = 678.08/x
  3. Step 3: Cross multiply
    958.76x = 1,321.68 × 678.08
  4. Step 4: Simplify right side
    958.76x = 896,204.77
  5. Step 5: Solve for x
    x = 896,204.77/958.76
  6. Step 6: Final answer
    x = 934.75

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.