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Finding the Fourth Proportional to 783.52, 1,081.28 and 434.21

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Solution

The fourth proportional to 783.52, 1,081.28 and 434.21 is: 599.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.52 : 1,081.28 = 434.21 : x
  2. Step 2: Convert to fraction form
    783.52/1,081.28 = 434.21/x
  3. Step 3: Cross multiply
    783.52x = 1,081.28 × 434.21
  4. Step 4: Simplify right side
    783.52x = 469,495.01
  5. Step 5: Solve for x
    x = 469,495.01/783.52
  6. Step 6: Final answer
    x = 599.21

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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.