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Finding the Fourth Proportional to 920.59, 1,379.13 and 572.29

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Solution

The fourth proportional to 920.59, 1,379.13 and 572.29 is: 857.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.59 : 1,379.13 = 572.29 : x
  2. Step 2: Convert to fraction form
    920.59/1,379.13 = 572.29/x
  3. Step 3: Cross multiply
    920.59x = 1,379.13 × 572.29
  4. Step 4: Simplify right side
    920.59x = 789,256.71
  5. Step 5: Solve for x
    x = 789,256.71/920.59
  6. Step 6: Final answer
    x = 857.34

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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.