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Finding the Fourth Proportional to 818.32, 1,129.71 and 631.41

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Solution

The fourth proportional to 818.32, 1,129.71 and 631.41 is: 871.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.32 : 1,129.71 = 631.41 : x
  2. Step 2: Convert to fraction form
    818.32/1,129.71 = 631.41/x
  3. Step 3: Cross multiply
    818.32x = 1,129.71 × 631.41
  4. Step 4: Simplify right side
    818.32x = 713,304.54
  5. Step 5: Solve for x
    x = 713,304.54/818.32
  6. Step 6: Final answer
    x = 871.67

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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.