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Finding the Fourth Proportional to 434.88, 599.68 and 390.80

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Solution

The fourth proportional to 434.88, 599.68 and 390.80 is: 538.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.88 : 599.68 = 390.80 : x
  2. Step 2: Convert to fraction form
    434.88/599.68 = 390.80/x
  3. Step 3: Cross multiply
    434.88x = 599.68 × 390.80
  4. Step 4: Simplify right side
    434.88x = 234,354.15
  5. Step 5: Solve for x
    x = 234,354.15/434.88
  6. Step 6: Final answer
    x = 538.89

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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.