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Finding the Fourth Proportional to 718.50, 989.88 and 608.60

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Solution

The fourth proportional to 718.50, 989.88 and 608.60 is: 838.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.50 : 989.88 = 608.60 : x
  2. Step 2: Convert to fraction form
    718.50/989.88 = 608.60/x
  3. Step 3: Cross multiply
    718.50x = 989.88 × 608.60
  4. Step 4: Simplify right side
    718.50x = 602,440.97
  5. Step 5: Solve for x
    x = 602,440.97/718.50
  6. Step 6: Final answer
    x = 838.47

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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.