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Finding the Fourth Proportional to 745.72, 1,113.12 and 690.75

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Solution

The fourth proportional to 745.72, 1,113.12 and 690.75 is: 1,031.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.72 : 1,113.12 = 690.75 : x
  2. Step 2: Convert to fraction form
    745.72/1,113.12 = 690.75/x
  3. Step 3: Cross multiply
    745.72x = 1,113.12 × 690.75
  4. Step 4: Simplify right side
    745.72x = 768,887.64
  5. Step 5: Solve for x
    x = 768,887.64/745.72
  6. Step 6: Final answer
    x = 1,031.07

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.