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Finding the Fourth Proportional to 1,127.36, 1,691.44 and 511

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Solution

The fourth proportional to 1,127.36, 1,691.44 and 511 is: 766.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.36 : 1,691.44 = 511 : x
  2. Step 2: Convert to fraction form
    1,127.36/1,691.44 = 511/x
  3. Step 3: Cross multiply
    1,127.36x = 1,691.44 × 511
  4. Step 4: Simplify right side
    1,127.36x = 864,325.84
  5. Step 5: Solve for x
    x = 864,325.84/1,127.36
  6. Step 6: Final answer
    x = 766.68

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Double scale
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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.