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Finding the Fourth Proportional to 783.82, 1,081.66 and 434.50

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Solution

The fourth proportional to 783.82, 1,081.66 and 434.50 is: 599.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.82 : 1,081.66 = 434.50 : x
  2. Step 2: Convert to fraction form
    783.82/1,081.66 = 434.50/x
  3. Step 3: Cross multiply
    783.82x = 1,081.66 × 434.50
  4. Step 4: Simplify right side
    783.82x = 469,981.27
  5. Step 5: Solve for x
    x = 469,981.27/783.82
  6. Step 6: Final answer
    x = 599.60

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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.