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Finding the Fourth Proportional to 1,127.39, 1,690.59 and 511.07

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Solution

The fourth proportional to 1,127.39, 1,690.59 and 511.07 is: 766.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.39 : 1,690.59 = 511.07 : x
  2. Step 2: Convert to fraction form
    1,127.39/1,690.59 = 511.07/x
  3. Step 3: Cross multiply
    1,127.39x = 1,690.59 × 511.07
  4. Step 4: Simplify right side
    1,127.39x = 864,014.06
  5. Step 5: Solve for x
    x = 864,014.06/1,127.39
  6. Step 6: Final answer
    x = 766.38

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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.