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Finding the Fourth Proportional to 710.05, 979.47 and 663.94

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Solution

The fourth proportional to 710.05, 979.47 and 663.94 is: 915.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.05 : 979.47 = 663.94 : x
  2. Step 2: Convert to fraction form
    710.05/979.47 = 663.94/x
  3. Step 3: Cross multiply
    710.05x = 979.47 × 663.94
  4. Step 4: Simplify right side
    710.05x = 650,304.41
  5. Step 5: Solve for x
    x = 650,304.41/710.05
  6. Step 6: Final answer
    x = 915.86

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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.