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Finding the Fourth Proportional to 910.97, 1,366.89 and 390.81

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Solution

The fourth proportional to 910.97, 1,366.89 and 390.81 is: 586.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.97 : 1,366.89 = 390.81 : x
  2. Step 2: Convert to fraction form
    910.97/1,366.89 = 390.81/x
  3. Step 3: Cross multiply
    910.97x = 1,366.89 × 390.81
  4. Step 4: Simplify right side
    910.97x = 534,199.04
  5. Step 5: Solve for x
    x = 534,199.04/910.97
  6. Step 6: Final answer
    x = 586.41

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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.