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Finding the Fourth Proportional to 745.68, 1,029.12 and 483.76

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Solution

The fourth proportional to 745.68, 1,029.12 and 483.76 is: 667.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.68 : 1,029.12 = 483.76 : x
  2. Step 2: Convert to fraction form
    745.68/1,029.12 = 483.76/x
  3. Step 3: Cross multiply
    745.68x = 1,029.12 × 483.76
  4. Step 4: Simplify right side
    745.68x = 497,847.09
  5. Step 5: Solve for x
    x = 497,847.09/745.68
  6. Step 6: Final answer
    x = 667.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.