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Finding the Fourth Proportional to 1,436.02, 1,981.20 and 815.02

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Solution

The fourth proportional to 1,436.02, 1,981.20 and 815.02 is: 1,124.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,436.02 : 1,981.20 = 815.02 : x
  2. Step 2: Convert to fraction form
    1,436.02/1,981.20 = 815.02/x
  3. Step 3: Cross multiply
    1,436.02x = 1,981.20 × 815.02
  4. Step 4: Simplify right side
    1,436.02x = 1,614,717.62
  5. Step 5: Solve for x
    x = 1,614,717.62/1,436.02
  6. Step 6: Final answer
    x = 1,124.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.