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Finding the Fourth Proportional to 1,127.39, 1,690.94 and 396.88

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Solution

The fourth proportional to 1,127.39, 1,690.94 and 396.88 is: 595.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.39 : 1,690.94 = 396.88 : x
  2. Step 2: Convert to fraction form
    1,127.39/1,690.94 = 396.88/x
  3. Step 3: Cross multiply
    1,127.39x = 1,690.94 × 396.88
  4. Step 4: Simplify right side
    1,127.39x = 671,089.83
  5. Step 5: Solve for x
    x = 671,089.83/1,127.39
  6. Step 6: Final answer
    x = 595.26

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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.