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Finding the Fourth Proportional to 745.59, 1,117.35 and 379.47

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Solution

The fourth proportional to 745.59, 1,117.35 and 379.47 is: 568.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.59 : 1,117.35 = 379.47 : x
  2. Step 2: Convert to fraction form
    745.59/1,117.35 = 379.47/x
  3. Step 3: Cross multiply
    745.59x = 1,117.35 × 379.47
  4. Step 4: Simplify right side
    745.59x = 424,000.80
  5. Step 5: Solve for x
    x = 424,000.80/745.59
  6. Step 6: Final answer
    x = 568.68

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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.