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Finding the Fourth Proportional to 988.42, 1,481 and 577.90

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Solution

The fourth proportional to 988.42, 1,481 and 577.90 is: 865.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.42 : 1,481 = 577.90 : x
  2. Step 2: Convert to fraction form
    988.42/1,481 = 577.90/x
  3. Step 3: Cross multiply
    988.42x = 1,481 × 577.90
  4. Step 4: Simplify right side
    988.42x = 855,869.90
  5. Step 5: Solve for x
    x = 855,869.90/988.42
  6. Step 6: Final answer
    x = 865.90

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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.