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Finding the Fourth Proportional to 988.89, 1,483.32 and 258.51

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Solution

The fourth proportional to 988.89, 1,483.32 and 258.51 is: 387.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.89 : 1,483.32 = 258.51 : x
  2. Step 2: Convert to fraction form
    988.89/1,483.32 = 258.51/x
  3. Step 3: Cross multiply
    988.89x = 1,483.32 × 258.51
  4. Step 4: Simplify right side
    988.89x = 383,453.05
  5. Step 5: Solve for x
    x = 383,453.05/988.89
  6. Step 6: Final answer
    x = 387.76

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1.5x scale

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.