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Finding the Fourth Proportional to 749.86, 1,126.23 and 621.64

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Solution

The fourth proportional to 749.86, 1,126.23 and 621.64 is: 933.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.86 : 1,126.23 = 621.64 : x
  2. Step 2: Convert to fraction form
    749.86/1,126.23 = 621.64/x
  3. Step 3: Cross multiply
    749.86x = 1,126.23 × 621.64
  4. Step 4: Simplify right side
    749.86x = 700,109.62
  5. Step 5: Solve for x
    x = 700,109.62/749.86
  6. Step 6: Final answer
    x = 933.65

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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.