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Finding the Fourth Proportional to 1,416.32, 2,123.76 and 636.20

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Solution

The fourth proportional to 1,416.32, 2,123.76 and 636.20 is: 953.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,416.32 : 2,123.76 = 636.20 : x
  2. Step 2: Convert to fraction form
    1,416.32/2,123.76 = 636.20/x
  3. Step 3: Cross multiply
    1,416.32x = 2,123.76 × 636.20
  4. Step 4: Simplify right side
    1,416.32x = 1,351,136.11
  5. Step 5: Solve for x
    x = 1,351,136.11/1,416.32
  6. Step 6: Final answer
    x = 953.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.