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Finding the Fourth Proportional to 745.86, 1,029.28 and 414.28

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Solution

The fourth proportional to 745.86, 1,029.28 and 414.28 is: 571.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.86 : 1,029.28 = 414.28 : x
  2. Step 2: Convert to fraction form
    745.86/1,029.28 = 414.28/x
  3. Step 3: Cross multiply
    745.86x = 1,029.28 × 414.28
  4. Step 4: Simplify right side
    745.86x = 426,410.12
  5. Step 5: Solve for x
    x = 426,410.12/745.86
  6. Step 6: Final answer
    x = 571.70

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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.