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Finding the Fourth Proportional to 1,079.16, 1,487.28 and 783.96

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Solution

The fourth proportional to 1,079.16, 1,487.28 and 783.96 is: 1,080.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.16 : 1,487.28 = 783.96 : x
  2. Step 2: Convert to fraction form
    1,079.16/1,487.28 = 783.96/x
  3. Step 3: Cross multiply
    1,079.16x = 1,487.28 × 783.96
  4. Step 4: Simplify right side
    1,079.16x = 1,165,968.03
  5. Step 5: Solve for x
    x = 1,165,968.03/1,079.16
  6. Step 6: Final answer
    x = 1,080.44

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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.