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Finding the Fourth Proportional to 988.60, 1,364.90 and 615.98

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Solution

The fourth proportional to 988.60, 1,364.90 and 615.98 is: 850.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.60 : 1,364.90 = 615.98 : x
  2. Step 2: Convert to fraction form
    988.60/1,364.90 = 615.98/x
  3. Step 3: Cross multiply
    988.60x = 1,364.90 × 615.98
  4. Step 4: Simplify right side
    988.60x = 840,751.10
  5. Step 5: Solve for x
    x = 840,751.10/988.60
  6. Step 6: Final answer
    x = 850.45

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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.