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Finding the Fourth Proportional to 418.15, 626.61 and 387.77

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Solution

The fourth proportional to 418.15, 626.61 and 387.77 is: 581.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.15 : 626.61 = 387.77 : x
  2. Step 2: Convert to fraction form
    418.15/626.61 = 387.77/x
  3. Step 3: Cross multiply
    418.15x = 626.61 × 387.77
  4. Step 4: Simplify right side
    418.15x = 242,980.56
  5. Step 5: Solve for x
    x = 242,980.56/418.15
  6. Step 6: Final answer
    x = 581.08

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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.