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Finding the Fourth Proportional to 988.60, 1,482.98 and 258.25

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Solution

The fourth proportional to 988.60, 1,482.98 and 258.25 is: 387.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.60 : 1,482.98 = 258.25 : x
  2. Step 2: Convert to fraction form
    988.60/1,482.98 = 258.25/x
  3. Step 3: Cross multiply
    988.60x = 1,482.98 × 258.25
  4. Step 4: Simplify right side
    988.60x = 382,979.59
  5. Step 5: Solve for x
    x = 382,979.59/988.60
  6. Step 6: Final answer
    x = 387.40

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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.