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Finding the Fourth Proportional to 609.76, 839.64 and 434.80

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Solution

The fourth proportional to 609.76, 839.64 and 434.80 is: 598.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.76 : 839.64 = 434.80 : x
  2. Step 2: Convert to fraction form
    609.76/839.64 = 434.80/x
  3. Step 3: Cross multiply
    609.76x = 839.64 × 434.80
  4. Step 4: Simplify right side
    609.76x = 365,075.47
  5. Step 5: Solve for x
    x = 365,075.47/609.76
  6. Step 6: Final answer
    x = 598.72

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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.