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Finding the Fourth Proportional to 631.89, 872.07 and 383.19

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Solution

The fourth proportional to 631.89, 872.07 and 383.19 is: 528.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.89 : 872.07 = 383.19 : x
  2. Step 2: Convert to fraction form
    631.89/872.07 = 383.19/x
  3. Step 3: Cross multiply
    631.89x = 872.07 × 383.19
  4. Step 4: Simplify right side
    631.89x = 334,168.50
  5. Step 5: Solve for x
    x = 334,168.50/631.89
  6. Step 6: Final answer
    x = 528.84

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.