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Finding the Fourth Proportional to 783.36, 1,080.72 and 576.72

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Solution

The fourth proportional to 783.36, 1,080.72 and 576.72 is: 795.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.36 : 1,080.72 = 576.72 : x
  2. Step 2: Convert to fraction form
    783.36/1,080.72 = 576.72/x
  3. Step 3: Cross multiply
    783.36x = 1,080.72 × 576.72
  4. Step 4: Simplify right side
    783.36x = 623,272.84
  5. Step 5: Solve for x
    x = 623,272.84/783.36
  6. Step 6: Final answer
    x = 795.64

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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.