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Finding the Fourth Proportional to 749.66, 1,123.45 and 359.51

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Solution

The fourth proportional to 749.66, 1,123.45 and 359.51 is: 538.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.66 : 1,123.45 = 359.51 : x
  2. Step 2: Convert to fraction form
    749.66/1,123.45 = 359.51/x
  3. Step 3: Cross multiply
    749.66x = 1,123.45 × 359.51
  4. Step 4: Simplify right side
    749.66x = 403,884.99
  5. Step 5: Solve for x
    x = 403,884.99/749.66
  6. Step 6: Final answer
    x = 538.76

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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.