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Finding the Fourth Proportional to 949.32, 1,421.28 and 623.70

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Solution

The fourth proportional to 949.32, 1,421.28 and 623.70 is: 933.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.32 : 1,421.28 = 623.70 : x
  2. Step 2: Convert to fraction form
    949.32/1,421.28 = 623.70/x
  3. Step 3: Cross multiply
    949.32x = 1,421.28 × 623.70
  4. Step 4: Simplify right side
    949.32x = 886,452.34
  5. Step 5: Solve for x
    x = 886,452.34/949.32
  6. Step 6: Final answer
    x = 933.78

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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.