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Finding the Fourth Proportional to 745.90, 1,119.94 and 515.14

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Solution

The fourth proportional to 745.90, 1,119.94 and 515.14 is: 773.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.90 : 1,119.94 = 515.14 : x
  2. Step 2: Convert to fraction form
    745.90/1,119.94 = 515.14/x
  3. Step 3: Cross multiply
    745.90x = 1,119.94 × 515.14
  4. Step 4: Simplify right side
    745.90x = 576,925.89
  5. Step 5: Solve for x
    x = 576,925.89/745.90
  6. Step 6: Final answer
    x = 773.46

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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.