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Finding the Fourth Proportional to 718.86, 991.83 and 498.06

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Solution

The fourth proportional to 718.86, 991.83 and 498.06 is: 687.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.86 : 991.83 = 498.06 : x
  2. Step 2: Convert to fraction form
    718.86/991.83 = 498.06/x
  3. Step 3: Cross multiply
    718.86x = 991.83 × 498.06
  4. Step 4: Simplify right side
    718.86x = 493,990.85
  5. Step 5: Solve for x
    x = 493,990.85/718.86
  6. Step 6: Final answer
    x = 687.19

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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.