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Finding the Fourth Proportional to 640.95, 884.35 and 430.75

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Solution

The fourth proportional to 640.95, 884.35 and 430.75 is: 594.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.95 : 884.35 = 430.75 : x
  2. Step 2: Convert to fraction form
    640.95/884.35 = 430.75/x
  3. Step 3: Cross multiply
    640.95x = 884.35 × 430.75
  4. Step 4: Simplify right side
    640.95x = 380,933.76
  5. Step 5: Solve for x
    x = 380,933.76/640.95
  6. Step 6: Final answer
    x = 594.33

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1.5x scale

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.