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Finding the Fourth Proportional to 638.77, 881.84 and 430.05

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Solution

The fourth proportional to 638.77, 881.84 and 430.05 is: 593.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.77 : 881.84 = 430.05 : x
  2. Step 2: Convert to fraction form
    638.77/881.84 = 430.05/x
  3. Step 3: Cross multiply
    638.77x = 881.84 × 430.05
  4. Step 4: Simplify right side
    638.77x = 379,235.29
  5. Step 5: Solve for x
    x = 379,235.29/638.77
  6. Step 6: Final answer
    x = 593.70

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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.