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Finding the Fourth Proportional to 745.61, 1,118.61 and 641.93

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Solution

The fourth proportional to 745.61, 1,118.61 and 641.93 is: 963.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.61 : 1,118.61 = 641.93 : x
  2. Step 2: Convert to fraction form
    745.61/1,118.61 = 641.93/x
  3. Step 3: Cross multiply
    745.61x = 1,118.61 × 641.93
  4. Step 4: Simplify right side
    745.61x = 718,063.72
  5. Step 5: Solve for x
    x = 718,063.72/745.61
  6. Step 6: Final answer
    x = 963.06

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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.