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Finding the Fourth Proportional to 1,036.55, 1,428.01 and 721.28

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Solution

The fourth proportional to 1,036.55, 1,428.01 and 721.28 is: 993.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.55 : 1,428.01 = 721.28 : x
  2. Step 2: Convert to fraction form
    1,036.55/1,428.01 = 721.28/x
  3. Step 3: Cross multiply
    1,036.55x = 1,428.01 × 721.28
  4. Step 4: Simplify right side
    1,036.55x = 1,029,990.48
  5. Step 5: Solve for x
    x = 1,029,990.48/1,036.55
  6. Step 6: Final answer
    x = 993.67

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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.