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Finding the Fourth Proportional to 750.86, 1,126.86 and 490.79

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Solution

The fourth proportional to 750.86, 1,126.86 and 490.79 is: 736.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.86 : 1,126.86 = 490.79 : x
  2. Step 2: Convert to fraction form
    750.86/1,126.86 = 490.79/x
  3. Step 3: Cross multiply
    750.86x = 1,126.86 × 490.79
  4. Step 4: Simplify right side
    750.86x = 553,045.99
  5. Step 5: Solve for x
    x = 553,045.99/750.86
  6. Step 6: Final answer
    x = 736.55

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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.