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Finding the Fourth Proportional to 988.97, 1,477.45 and 639.46

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Solution

The fourth proportional to 988.97, 1,477.45 and 639.46 is: 955.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.97 : 1,477.45 = 639.46 : x
  2. Step 2: Convert to fraction form
    988.97/1,477.45 = 639.46/x
  3. Step 3: Cross multiply
    988.97x = 1,477.45 × 639.46
  4. Step 4: Simplify right side
    988.97x = 944,770.18
  5. Step 5: Solve for x
    x = 944,770.18/988.97
  6. Step 6: Final answer
    x = 955.31

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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.