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Finding the Fourth Proportional to 988.62, 1,364.40 and 615.96

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Solution

The fourth proportional to 988.62, 1,364.40 and 615.96 is: 850.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.62 : 1,364.40 = 615.96 : x
  2. Step 2: Convert to fraction form
    988.62/1,364.40 = 615.96/x
  3. Step 3: Cross multiply
    988.62x = 1,364.40 × 615.96
  4. Step 4: Simplify right side
    988.62x = 840,415.82
  5. Step 5: Solve for x
    x = 840,415.82/988.62
  6. Step 6: Final answer
    x = 850.09

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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.