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Finding the Fourth Proportional to 719.40, 994.40 and 661.99

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Solution

The fourth proportional to 719.40, 994.40 and 661.99 is: 915.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.40 : 994.40 = 661.99 : x
  2. Step 2: Convert to fraction form
    719.40/994.40 = 661.99/x
  3. Step 3: Cross multiply
    719.40x = 994.40 × 661.99
  4. Step 4: Simplify right side
    719.40x = 658,282.86
  5. Step 5: Solve for x
    x = 658,282.86/719.40
  6. Step 6: Final answer
    x = 915.04

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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.