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Finding the Fourth Proportional to 745.83, 1,118.30 and 499.31

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Solution

The fourth proportional to 745.83, 1,118.30 and 499.31 is: 748.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.83 : 1,118.30 = 499.31 : x
  2. Step 2: Convert to fraction form
    745.83/1,118.30 = 499.31/x
  3. Step 3: Cross multiply
    745.83x = 1,118.30 × 499.31
  4. Step 4: Simplify right side
    745.83x = 558,374.03
  5. Step 5: Solve for x
    x = 558,374.03/745.83
  6. Step 6: Final answer
    x = 748.66

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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.