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Finding the Fourth Proportional to 988.74, 1,365.15 and 615.87

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Solution

The fourth proportional to 988.74, 1,365.15 and 615.87 is: 850.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.74 : 1,365.15 = 615.87 : x
  2. Step 2: Convert to fraction form
    988.74/1,365.15 = 615.87/x
  3. Step 3: Cross multiply
    988.74x = 1,365.15 × 615.87
  4. Step 4: Simplify right side
    988.74x = 840,754.93
  5. Step 5: Solve for x
    x = 840,754.93/988.74
  6. Step 6: Final answer
    x = 850.33

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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.