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Finding the Fourth Proportional to 619.55, 928.30 and 436.05

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Solution

The fourth proportional to 619.55, 928.30 and 436.05 is: 653.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.55 : 928.30 = 436.05 : x
  2. Step 2: Convert to fraction form
    619.55/928.30 = 436.05/x
  3. Step 3: Cross multiply
    619.55x = 928.30 × 436.05
  4. Step 4: Simplify right side
    619.55x = 404,778.39
  5. Step 5: Solve for x
    x = 404,778.39/619.55
  6. Step 6: Final answer
    x = 653.35

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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.