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Finding the Fourth Proportional to 418.76, 577.30 and 315.08

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Solution

The fourth proportional to 418.76, 577.30 and 315.08 is: 434.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.76 : 577.30 = 315.08 : x
  2. Step 2: Convert to fraction form
    418.76/577.30 = 315.08/x
  3. Step 3: Cross multiply
    418.76x = 577.30 × 315.08
  4. Step 4: Simplify right side
    418.76x = 181,895.68
  5. Step 5: Solve for x
    x = 181,895.68/418.76
  6. Step 6: Final answer
    x = 434.37

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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.