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Finding the Fourth Proportional to 783.12, 1,080.64 and 451.50

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Solution

The fourth proportional to 783.12, 1,080.64 and 451.50 is: 623.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.12 : 1,080.64 = 451.50 : x
  2. Step 2: Convert to fraction form
    783.12/1,080.64 = 451.50/x
  3. Step 3: Cross multiply
    783.12x = 1,080.64 × 451.50
  4. Step 4: Simplify right side
    783.12x = 487,908.96
  5. Step 5: Solve for x
    x = 487,908.96/783.12
  6. Step 6: Final answer
    x = 623.03

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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.