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Finding the Fourth Proportional to 745.87, 1,113.78 and 609.18

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Solution

The fourth proportional to 745.87, 1,113.78 and 609.18 is: 909.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.87 : 1,113.78 = 609.18 : x
  2. Step 2: Convert to fraction form
    745.87/1,113.78 = 609.18/x
  3. Step 3: Cross multiply
    745.87x = 1,113.78 × 609.18
  4. Step 4: Simplify right side
    745.87x = 678,489.45
  5. Step 5: Solve for x
    x = 678,489.45/745.87
  6. Step 6: Final answer
    x = 909.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.