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Finding the Fourth Proportional to 1,127.10, 1,690.63 and 578.96

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Solution

The fourth proportional to 1,127.10, 1,690.63 and 578.96 is: 868.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.10 : 1,690.63 = 578.96 : x
  2. Step 2: Convert to fraction form
    1,127.10/1,690.63 = 578.96/x
  3. Step 3: Cross multiply
    1,127.10x = 1,690.63 × 578.96
  4. Step 4: Simplify right side
    1,127.10x = 978,807.14
  5. Step 5: Solve for x
    x = 978,807.14/1,127.10
  6. Step 6: Final answer
    x = 868.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.