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Finding the Fourth Proportional to 920.13, 1,269.46 and 521.75

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Solution

The fourth proportional to 920.13, 1,269.46 and 521.75 is: 719.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.13 : 1,269.46 = 521.75 : x
  2. Step 2: Convert to fraction form
    920.13/1,269.46 = 521.75/x
  3. Step 3: Cross multiply
    920.13x = 1,269.46 × 521.75
  4. Step 4: Simplify right side
    920.13x = 662,340.76
  5. Step 5: Solve for x
    x = 662,340.76/920.13
  6. Step 6: Final answer
    x = 719.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.