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Finding the Fourth Proportional to 1,144.11, 1,715.64 and 485.91

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Solution

The fourth proportional to 1,144.11, 1,715.64 and 485.91 is: 728.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,144.11 : 1,715.64 = 485.91 : x
  2. Step 2: Convert to fraction form
    1,144.11/1,715.64 = 485.91/x
  3. Step 3: Cross multiply
    1,144.11x = 1,715.64 × 485.91
  4. Step 4: Simplify right side
    1,144.11x = 833,644.81
  5. Step 5: Solve for x
    x = 833,644.81/1,144.11
  6. Step 6: Final answer
    x = 728.64

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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.