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Finding the Fourth Proportional to 1,143.72, 1,715.84 and 485.61

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Solution

The fourth proportional to 1,143.72, 1,715.84 and 485.61 is: 728.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.72 : 1,715.84 = 485.61 : x
  2. Step 2: Convert to fraction form
    1,143.72/1,715.84 = 485.61/x
  3. Step 3: Cross multiply
    1,143.72x = 1,715.84 × 485.61
  4. Step 4: Simplify right side
    1,143.72x = 833,222.02
  5. Step 5: Solve for x
    x = 833,222.02/1,143.72
  6. Step 6: Final answer
    x = 728.52

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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.