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Finding the Fourth Proportional to 910.56, 1,365.39 and 423.96

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Solution

The fourth proportional to 910.56, 1,365.39 and 423.96 is: 635.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.56 : 1,365.39 = 423.96 : x
  2. Step 2: Convert to fraction form
    910.56/1,365.39 = 423.96/x
  3. Step 3: Cross multiply
    910.56x = 1,365.39 × 423.96
  4. Step 4: Simplify right side
    910.56x = 578,870.74
  5. Step 5: Solve for x
    x = 578,870.74/910.56
  6. Step 6: Final answer
    x = 635.73

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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.