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Finding the Fourth Proportional to 1,312.86, 1,811.87 and 723.53

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Solution

The fourth proportional to 1,312.86, 1,811.87 and 723.53 is: 998.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.86 : 1,811.87 = 723.53 : x
  2. Step 2: Convert to fraction form
    1,312.86/1,811.87 = 723.53/x
  3. Step 3: Cross multiply
    1,312.86x = 1,811.87 × 723.53
  4. Step 4: Simplify right side
    1,312.86x = 1,310,942.30
  5. Step 5: Solve for x
    x = 1,310,942.30/1,312.86
  6. Step 6: Final answer
    x = 998.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.