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Finding the Fourth Proportional to 790.62, 1,188.09 and 545.46

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Solution

The fourth proportional to 790.62, 1,188.09 and 545.46 is: 819.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.62 : 1,188.09 = 545.46 : x
  2. Step 2: Convert to fraction form
    790.62/1,188.09 = 545.46/x
  3. Step 3: Cross multiply
    790.62x = 1,188.09 × 545.46
  4. Step 4: Simplify right side
    790.62x = 648,055.57
  5. Step 5: Solve for x
    x = 648,055.57/790.62
  6. Step 6: Final answer
    x = 819.68

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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.