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Finding the Fourth Proportional to 718.88, 991.58 and 608.18

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Solution

The fourth proportional to 718.88, 991.58 and 608.18 is: 838.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.88 : 991.58 = 608.18 : x
  2. Step 2: Convert to fraction form
    718.88/991.58 = 608.18/x
  3. Step 3: Cross multiply
    718.88x = 991.58 × 608.18
  4. Step 4: Simplify right side
    718.88x = 603,059.12
  5. Step 5: Solve for x
    x = 603,059.12/718.88
  6. Step 6: Final answer
    x = 838.89

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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.