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Finding the Fourth Proportional to 783.18, 1,080.68 and 451.62

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Solution

The fourth proportional to 783.18, 1,080.68 and 451.62 is: 623.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.18 : 1,080.68 = 451.62 : x
  2. Step 2: Convert to fraction form
    783.18/1,080.68 = 451.62/x
  3. Step 3: Cross multiply
    783.18x = 1,080.68 × 451.62
  4. Step 4: Simplify right side
    783.18x = 488,054.44
  5. Step 5: Solve for x
    x = 488,054.44/783.18
  6. Step 6: Final answer
    x = 623.17

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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.