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Finding the Fourth Proportional to 670.88, 998.95 and 663.53

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Solution

The fourth proportional to 670.88, 998.95 and 663.53 is: 988.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.88 : 998.95 = 663.53 : x
  2. Step 2: Convert to fraction form
    670.88/998.95 = 663.53/x
  3. Step 3: Cross multiply
    670.88x = 998.95 × 663.53
  4. Step 4: Simplify right side
    670.88x = 662,833.29
  5. Step 5: Solve for x
    x = 662,833.29/670.88
  6. Step 6: Final answer
    x = 988.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.