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Finding the Fourth Proportional to 988.84, 1,361.10 and 915.94

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Solution

The fourth proportional to 988.84, 1,361.10 and 915.94 is: 1,260.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.84 : 1,361.10 = 915.94 : x
  2. Step 2: Convert to fraction form
    988.84/1,361.10 = 915.94/x
  3. Step 3: Cross multiply
    988.84x = 1,361.10 × 915.94
  4. Step 4: Simplify right side
    988.84x = 1,246,685.93
  5. Step 5: Solve for x
    x = 1,246,685.93/988.84
  6. Step 6: Final answer
    x = 1,260.76

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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.