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Finding the Fourth Proportional to 745.58, 1,117.85 and 379.65

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Solution

The fourth proportional to 745.58, 1,117.85 and 379.65 is: 569.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.58 : 1,117.85 = 379.65 : x
  2. Step 2: Convert to fraction form
    745.58/1,117.85 = 379.65/x
  3. Step 3: Cross multiply
    745.58x = 1,117.85 × 379.65
  4. Step 4: Simplify right side
    745.58x = 424,389.85
  5. Step 5: Solve for x
    x = 424,389.85/745.58
  6. Step 6: Final answer
    x = 569.21

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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.