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Finding the Fourth Proportional to 418.90, 577.99 and 253.08

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Solution

The fourth proportional to 418.90, 577.99 and 253.08 is: 349.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.90 : 577.99 = 253.08 : x
  2. Step 2: Convert to fraction form
    418.90/577.99 = 253.08/x
  3. Step 3: Cross multiply
    418.90x = 577.99 × 253.08
  4. Step 4: Simplify right side
    418.90x = 146,278.50
  5. Step 5: Solve for x
    x = 146,278.50/418.90
  6. Step 6: Final answer
    x = 349.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.