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Finding the Fourth Proportional to 988.40, 1,482.60 and 257.99

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Solution

The fourth proportional to 988.40, 1,482.60 and 257.99 is: 386.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.40 : 1,482.60 = 257.99 : x
  2. Step 2: Convert to fraction form
    988.40/1,482.60 = 257.99/x
  3. Step 3: Cross multiply
    988.40x = 1,482.60 × 257.99
  4. Step 4: Simplify right side
    988.40x = 382,489.53
  5. Step 5: Solve for x
    x = 382,489.53/988.40
  6. Step 6: Final answer
    x = 386.98

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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.