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Finding the Fourth Proportional to 1,458.91, 2,188.77 and 485.11

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Solution

The fourth proportional to 1,458.91, 2,188.77 and 485.11 is: 727.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,458.91 : 2,188.77 = 485.11 : x
  2. Step 2: Convert to fraction form
    1,458.91/2,188.77 = 485.11/x
  3. Step 3: Cross multiply
    1,458.91x = 2,188.77 × 485.11
  4. Step 4: Simplify right side
    1,458.91x = 1,061,794.21
  5. Step 5: Solve for x
    x = 1,061,794.21/1,458.91
  6. Step 6: Final answer
    x = 727.80

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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.