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Finding the Fourth Proportional to 910.10, 1,365.39 and 389.84

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Solution

The fourth proportional to 910.10, 1,365.39 and 389.84 is: 584.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.10 : 1,365.39 = 389.84 : x
  2. Step 2: Convert to fraction form
    910.10/1,365.39 = 389.84/x
  3. Step 3: Cross multiply
    910.10x = 1,365.39 × 389.84
  4. Step 4: Simplify right side
    910.10x = 532,283.64
  5. Step 5: Solve for x
    x = 532,283.64/910.10
  6. Step 6: Final answer
    x = 584.86

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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.