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Finding the Fourth Proportional to 385.90, 577.33 and 298.57

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Solution

The fourth proportional to 385.90, 577.33 and 298.57 is: 446.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.90 : 577.33 = 298.57 : x
  2. Step 2: Convert to fraction form
    385.90/577.33 = 298.57/x
  3. Step 3: Cross multiply
    385.90x = 577.33 × 298.57
  4. Step 4: Simplify right side
    385.90x = 172,373.42
  5. Step 5: Solve for x
    x = 172,373.42/385.90
  6. Step 6: Final answer
    x = 446.68

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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.