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Finding the Fourth Proportional to 640.56, 883.62 and 430.77

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Solution

The fourth proportional to 640.56, 883.62 and 430.77 is: 594.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.56 : 883.62 = 430.77 : x
  2. Step 2: Convert to fraction form
    640.56/883.62 = 430.77/x
  3. Step 3: Cross multiply
    640.56x = 883.62 × 430.77
  4. Step 4: Simplify right side
    640.56x = 380,636.99
  5. Step 5: Solve for x
    x = 380,636.99/640.56
  6. Step 6: Final answer
    x = 594.23

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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.