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Finding the Fourth Proportional to 988.40, 1,482.39 and 372.09

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Solution

The fourth proportional to 988.40, 1,482.39 and 372.09 is: 558.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.40 : 1,482.39 = 372.09 : x
  2. Step 2: Convert to fraction form
    988.40/1,482.39 = 372.09/x
  3. Step 3: Cross multiply
    988.40x = 1,482.39 × 372.09
  4. Step 4: Simplify right side
    988.40x = 551,573.22
  5. Step 5: Solve for x
    x = 551,573.22/988.40
  6. Step 6: Final answer
    x = 558.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.