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Finding the Fourth Proportional to 920.64, 1,379.79 and 458.58

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Solution

The fourth proportional to 920.64, 1,379.79 and 458.58 is: 687.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.64 : 1,379.79 = 458.58 : x
  2. Step 2: Convert to fraction form
    920.64/1,379.79 = 458.58/x
  3. Step 3: Cross multiply
    920.64x = 1,379.79 × 458.58
  4. Step 4: Simplify right side
    920.64x = 632,744.10
  5. Step 5: Solve for x
    x = 632,744.10/920.64
  6. Step 6: Final answer
    x = 687.29

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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.