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Finding the Fourth Proportional to 1,436.39, 2,153.87 and 511.67

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Solution

The fourth proportional to 1,436.39, 2,153.87 and 511.67 is: 767.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,436.39 : 2,153.87 = 511.67 : x
  2. Step 2: Convert to fraction form
    1,436.39/2,153.87 = 511.67/x
  3. Step 3: Cross multiply
    1,436.39x = 2,153.87 × 511.67
  4. Step 4: Simplify right side
    1,436.39x = 1,102,070.66
  5. Step 5: Solve for x
    x = 1,102,070.66/1,436.39
  6. Step 6: Final answer
    x = 767.25

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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.