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Finding the Fourth Proportional to 988.59, 1,482.88 and 258.15

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Solution

The fourth proportional to 988.59, 1,482.88 and 258.15 is: 387.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.59 : 1,482.88 = 258.15 : x
  2. Step 2: Convert to fraction form
    988.59/1,482.88 = 258.15/x
  3. Step 3: Cross multiply
    988.59x = 1,482.88 × 258.15
  4. Step 4: Simplify right side
    988.59x = 382,805.47
  5. Step 5: Solve for x
    x = 382,805.47/988.59
  6. Step 6: Final answer
    x = 387.22

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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.