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Finding the Fourth Proportional to 783.76, 1,081.40 and 434.45

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Solution

The fourth proportional to 783.76, 1,081.40 and 434.45 is: 599.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.76 : 1,081.40 = 434.45 : x
  2. Step 2: Convert to fraction form
    783.76/1,081.40 = 434.45/x
  3. Step 3: Cross multiply
    783.76x = 1,081.40 × 434.45
  4. Step 4: Simplify right side
    783.76x = 469,806.65
  5. Step 5: Solve for x
    x = 469,806.65/783.76
  6. Step 6: Final answer
    x = 599.43

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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.